Internet-Draft json-proof-algorithms July 2025
Jones, et al. Expires 8 January 2026 [Page]
Workgroup:
jose
Internet-Draft:
draft-ietf-jose-json-proof-algorithms-latest
Published:
Intended Status:
Standards Track
Expires:
Authors:
M. Jones
Self-Issued Consulting
D. Waite
Ping Identity
J. Miller
Ping Identity

JSON Proof Algorithms

Abstract

The JSON Proof Algorithms (JPA) specification registers cryptographic algorithms and identifiers to be used with the JSON Web Proof, JSON Web Key (JWK), and COSE specifications. It defines IANA registries for these identifiers.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 8 January 2026.

Table of Contents

1. Introduction

The JSON Web Proof (JWP) [I-D.ietf-jose-json-web-proof] draft establishes a new secure container format that supports selective disclosure and unlinkability using Zero-Knowledge Proofs (ZKPs) or other cryptographic algorithms.

Editor's Note: This draft is still early and incomplete. There will be significant changes to the algorithms as currently defined here. Please do not use any of these definitions or examples for anything except personal experimentation and learning. Contributions and feedback are welcomed at https://github.com/ietf-wg-jose/json-web-proof.

2. Conventions and Definitions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.

The roles of "issuer", "holder", and "verifier" are used as defined by the VC Data Model [VC-DATA-MODEL-2.0]. The term "presentation" is also used as defined by this source, but the term "credential" is avoided in this specification to minimize confusion with other definitions.

3. Terminology

The terms "JSON Web Signature (JWS)", "Base64url Encoding", "Header Parameter", "JOSE Header", "JWS Payload", "JWS Signature", and "JWS Protected Header" are defined by [RFC7515].

The terms "JSON Web Proof (JWP)", "JWP Payload", "JWP Proof", and "JWP Protected Header" are defined by [I-D.ietf-jose-json-web-proof].

These terms are defined by this specification:

Stable Key:
An asymmetric key-pair used by an issuer that is also shared via an out-of-band mechanism to a verifier to validate the signature.
Ephemeral Key:
An asymmetric key-pair that is generated for one-time use by an issuer and never stored or used again outside of the creation of a single JWP.
Presentation Key:
An asymmetric key-pair that is generated by a holder and used to ensure that a presentation is not able to be replayed by any other party.

4. Background

JWP defines a container binding together a protected header, one or more payloads, and a cryptographic proof. It does not define any details about the interactions between an application and the cryptographic libraries that implement proof-supporting algorithms.

Due to the nature of ZKPs, this specification also documents the subtle but important differences in proof algorithms versus those defined by the JSON Web Algorithms [RFC7518]. These differences help support more advanced capabilities such as blinded signatures and predicate proofs.

5. Algorithm Basics

The four principal interactions that every proof algorithm MUST support are issue, confirm, present, and verify.

5.1. Issue

The JWP is first created as the output of a JPA's issue operation.

Every algorithm MUST support a JSON issuer protected header along with one or more octet string payloads. The algorithm MAY support using additional items provided by the holder for issuance such as blinded payloads, keys for replay prevention, etc.

All algorithms MUST provide integrity protection for the issuer header and all payloads and MUST specify all digest and/or hash2curve methods used.

5.2. Confirm

Performed by the holder to validate that the issued JWP is correctly formed and protected.

Each algorithm MAY support using additional input items options, such as those sent to the issuer for issuance. After confirmation, an algorithm MAY return a modified JWP for serialized storage without the local state (such as with blinded payloads now unblinded).

The algorithm MUST fully verify the issued proof value against the issuer protected header and all payloads. If given a presented JWP instead of an issued one, the confirm process MUST return an error.

5.3. Present

Used to apply any selective disclosure choices and perform any unlinkability transformations, as well as to show binding.

An algorithm MAY support additional input options from the requesting party, such as for predicate proofs and verifiable computation requests.

Every algorithm MUST support the ability to hide any or all payloads. It MUST always include the issuer protected header unmodified in the presentation.

The algorithm MUST replace the issued proof value and generate a new presented proof value. It also MUST include a new presentation protected header that provides replay protection.

5.4. Verify

Performed by the verifier to verify the protected headers along with any disclosed payloads and/or assertions about them from the proving party, while also verifying they are the same payloads and ordering as witnessed by the issuer.

The algorithm MUST verify the integrity of all disclosed payloads and MUST also verify the integrity of both the issuer and presentation protected headers.

If the presented proof contains any assertions about the hidden payloads, the algorithm MUST also verify all of those assertions. It MAY support additional options, such as those sent to the holder to generate the presentation.

If given an issued JWP for verification, the algorithm MUST return an error.

6. Algorithm Specifications

This section defines how to use specific algorithms for JWPs.

6.1. Single Use

The Single Use (SU) algorithm is based on composing multiple traditional asymmetric signatures into a single JWP proof. It enables a very simple form of selective disclosure without requiring any advanced cryptographic techniques.

It does not support unlinkability if the same JWP is presented multiple times, therefore when privacy is required the holder will need to interact with the issuer again to receive new single-use JWPs (dynamically or in batches).

6.1.1. JWS Algorithm

The Single Use algorithm uses multiple signing keys to protect the protected header as well as individual payloads of an Issued JWP. The issuer uses a stable public key to sign each protected header, and a per-JWP ephemeral key (conveyed within the protected header) to protect the individual payloads. These signatures are all created using the same Asymmetric Algorithm, with the JOSE and COSE name/label of this algorithm being part of registration for a fully-specified Single Use algorithm identifier.

The issuer protected header also conveys a holder presentation key, an ephemeral asymmetric key meant to only be used for presenting a single JWP. The fully-specified algorithm the holder must use for presentations is also included. This algorithm MAY be different from the algorithm used by the issuer.

The chosen algorithms MUST be asymmetric signing algorithms, so that each signature can be verified without sharing any private values between the parties.

6.1.2. Holder Setup

In order to support the protection of a presentation by a holder to a verifier, the holder MUST use a Presentation Key during the issuance and the presentation of every Single Use JWP. This Presentation Key MUST be generated and used for only one JWP.

The issuer MUST verify that the holder has possession of this key. The holder-issuer communication to exchange this information is out of scope of this specification, but can be accomplished by the holder using this key to generate a JWS that signs a value the issuer can verify as unique.

The issuer MUST determine an appropriate holder presentation algorithm corresponding to the presentation key. If the holder and verifier cannot be assumed to know this algorithm is the appropriate choice for a given presentation key, this value MUST be conveyed in the hpa issuer protected header.

6.1.3. Issuer Setup

To create a Single Use JWP, the issuer first generates a unique Ephemeral Key using the selected internal algorithm. This key-pair will be used to sign each of the payloads of a single JWP and then discarded.

6.1.4. Signing Payloads

Each individual payload is signed using the selected internal algorithm using the Ephemeral Key.

6.1.5. Issuer Protected Header

The Issuer's Ephemeral Key MUST be included via the Proof Key header parameter.

The Holder's Presentation Key MUST be included via the Presentation Key header parameter.

The Holder's Presentation Algorithm MUST be included via the Holder Presentation Algorithm header parameter unless there is another way for the holder and verifier to unambiguously determine the appropriate algorithm to use.

The Issuer Protected Header is signed using the appropriate internal signing algorithm for the given fully-specified single use algorithm, using the issuer's Stable Key.

6.1.6. Payloads

Each JWP payload is processed in order and signed using the given JWA using the issuer's Ephemeral Key.

6.1.7. Proof

The proof value is an octet string array. The first entry is the octet string of the issuer protected header signature, with an additional entry for each payload signature.

6.1.8. Presentation Protected Header #{presentation-protected-header}

To generate a new presentation, the holder first creates a presentation protected header that is specific to the verifier being presented to. This header MUST contain a parameter that both the holder and verifier trust as being unique and non-replayable. Use of the nonce header parameter is RECOMMENDED for this purpose.

This specification registers the nonce header parameter for the presentation protected header that contains a string value either generated by the verifier or derived from values provided by the verifier. When present, the verifier MUST ensure the nonce value matches during verification.

The presentation protected header MAY contain other header parameters that are either provided by the verifier or by the holder. These presentation header parameters SHOULD NOT contain values that are common across multiple presentations and SHOULD be unique to a single presentation and verifier.

The presentation protected header MUST contain the same Algorithm protected header as the issuer protected header. The Holder Presentation Algorithm protected header MUST NOT be included.

6.1.9. Presentation

The holder derives a new proof as part of presentation. The holder will also use these components to generate a presentation internal representation. The number of components depends on the number of payloads which are being disclosed in the presented JWP.

The first proof component will be the signature over the issuer protected header made by the issuer's Stable Key.

For each payload which is to be disclosed, the corresponding payload signature (from the issued JWP) is included as a subsequent proof component. If the payload is being omitted, the corresponding payload signature is omitted from the proof components.

The holder protected header, issuer protected header, payload slots (distinguishing which are being disclosed) and these proof components are inputs to determine the presentation internal representation.

The holder's signature over the presentation internal representation (using the holder's private key and the holder presentation algorithm) is then included as one additional proof component in the final presentation.

For example, if only the second and fifth of five payloads are being disclosed, then the proof at this stage will consist of three values:

  1. The issuer's signature over the issuer protected header
  2. The payload signature corresponding to the second payload
  3. The payload signature corresponding to the fifth payload.

The presentation internal representation would be calculated with these three proof components, while the final presentation would have an additional fourth component containing the signature using the holder's private key.

Since the individual signatures in the proof value are unique and remain unchanged across multiple presentations, a Single Use JWP SHOULD only be presented a single time to each verifier in order for the holder to remain unlinkable across multiple presentations.

6.1.10. Verification of Presentation

Verification is performed using the following steps.

  1. Check that the number of proof components is appropriate for the number of disclosed payloads. There MUST be two more proof components than disclosed payloads.
  2. Verify the first proof component is a valid signature over issuer protected header octets, using the issuer's stable key.
  3. Extract the presentation key and holder presentation algorithm (if present) from the issuer protected header.
  4. Omitting the final payload component, calculate the presentation internal representation.
  5. Verify the final proof component is a valid signature over the presentation internal binary form, using the holder's presentation key and the extracted (or otherwise determined) holder presentation algorithm.
  6. For each remaining proof component, verify they form a valid signature over each disclosed payload in sequence, using the issuer's ephemeral key.

6.1.11. JPA Registration

The proposed JWP alg value is of the format "SU-" appended with the relevant JWS alg value for the chosen public and ephemeral key-pair algorithm, for example "SU-ES256".

6.2. Presentation Internal Representation

Some algorithms (such as Single use and MAC) use a holder key to provide integrity over the presentation. For these algorithms, an internal binary form of the presentation must be generated both for signing by the holder, and for verification by the verifier. Other algorithms MAY use this same form for consistency.

The instructions for creating this binary representation will also create well-formed CBOR, although this data is not meant to be shared outside the implementing algorithm. Instead, it focuses on simplicity of generation by the holder and verifier implementations. Although CBOR has multiple representations of the same underlying information, this same octet string MUST be generated by an implementation.

When a length or count is added by the steps below, it is added as its 8 byte, network-ordered representation. For example, the length of a 1,234 byte payload would have a length representation of 0x00 00 00 00 00 00 04 D2.

The binary representation is created by appending data into a single octet string in the following order:

  1. 0x84 5B
  2. The length and octets of the presentation protected header
  3. 0x5B
  4. The length and octets of the issuer protected header
  5. 0x9B
  6. The number of payload slots in the issued message
  7. For each payload representation:

    • If the payload is being omitted, the value 0xF6
    • Otherwise:

      1. 0x5B
      2. The length and octets of the payload
  8. 0x9B

  9. The number of proof components as specified by the algorithm

  10. For each proof component, append:

    1. 0x5B
    2. The length and octets of the proof component

6.3. BBS

The BBS Signature Scheme [I-D.irtf-cfrg-bbs-signatures] is under active development within the CRFG.

This algorithm supports both selective disclosure and unlinkability, enabling the holder to generate multiple presentations from one issued JWP without a verifier being able to correlate those presentations together based on the proof.

6.3.1. JPA Algorithms

The BBS algorithm corresponds to a ciphersuite identifier of BBS_BLS12381G1_XMD:SHA-256_SSWU_RO_.

6.3.2. Key Format

The key used for the BBS algorithm is an elliptic curve-based key pair, specifically against the G_2 subgroup of a pairing friendly curve. Additional details on key generation can be found in Section 3.4. The JWK and Cose Key Object representations of the key are detailed in [I-D.ietf-cose-bls-key-representations].

There is no additional holder presentation key necessary for presentation proofs.

6.3.3. Issuance

Issuance is performed using the Sign operation from Section 3.5.1 of [I-D.irtf-cfrg-bbs-signatures]. This operation utilizes the issuer's BLS12-381 G2 key pair as SK and PK, along with desired protected header octets as header, and the array of payload octet string as messages.

The octets resulting from this operation form a single octet string in the issuance proof array, to be used along with the protected header and payloads to serialize the JWP.

6.3.4. Issuance Proof Verification

Holder verification of the signature on issuance form is performed using the Verify operation from [@!I-D.irtf-cfrg-bbs-signatures, section 3.5.2].

This operation utilizes the issuer's public key as PK, the proof as signature, the protected header octets as header and the array of payload octets as messages.

6.3.5. Presentation

Derivation of a presentation is done by the holder using the ProofGen operation from Section 3.5.3 of [I-D.irtf-cfrg-bbs-signatures].

This operation utilizes the issuer's public key as PK, the issuer protected header as header, the issuance proof as signature, the issuance payloads as messages, and the holder's presentation protected header as ph.

The operation also takes a vector of indexes into messages, describing which payloads the holder wishes to disclose. All payloads are required for proof generation, but only these indicated payloads will be required to be disclosed for later proof verification.

The output of this operation is the presentation proof, as a single octet string.

Presentation serialization leverages the two protected headers and presentation proof, along with the disclosed payloads. Non-disclosed payloads are represented with the absent value of null in CBOR serialization and a zero-length string in compact serialization.

6.3.6. Presentation Verification

Verification of a presentation is done by the verifier using the ProofVerify operation from [@!I-D.irtf-cfrg-bbs-signatures, Section 3.5.4].

This operation utilizes the issuer's public key as PK, the issuer protected header as header, the issuance proof as signature, the holder's presentation protected header as ph, and the payloads as disclosed_messages.

In addition, the disclosed_indexes scalar array is calculated from the payloads provided. Values disclosed in the presented payloads have a zero-based index in this array, while the indices of absent payloads are omitted.

6.4. Message Authentication Code

The Message Authentication Code (MAC) JPA uses a MAC to both generate ephemeral secrets and to authenticate payloads, along with an asymmetric signature to provide integrity to the issued JWP.

The holder can manipulate which payloads are disclosed from the issued JWP, and uses the holder Presentation Key to create a presentation. The signature created from the Holder Presentation Key MAY use a different algorithm than the Issuer used to sign the issued form.

Like the Single Use algorithm family, it also does not support unlinkability if the same JWP is presented multiple times and requires an individually issued JWP for each presentation in order to fully protect privacy. When compared to the JWS approach, using a MAC requires less computation but can result in potentially larger presentation proof values.

The design is intentionally minimal and only involves using a single standardized MAC method instead of a mix of MAC/hash methods or a custom hash-based construct. It is able to use any published cryptographic MAC method such as HMAC [RFC2104] or KMAC. It uses traditional public key-based signatures to verify the authenticity of the issuer and holder.

6.4.1. Holder Setup

Prior to the issuer creating a new JWP, the issuer MUST have a presentation public key provided by the holder.

The holder's presentation key MUST be included in the issuer's protected header using the Presentation Key header parameter.

The issuer MUST determine an appropriate holder presentation algorithm corresponding to the presentation key. If the holder and verifier cannot be assumed to know this algorithm is the appropriate choice for a given presentation key, this value MUST be conveyed in the Holder Protected algorithm header parameter.

6.4.2. Issuer Setup

To use the MAC algorithm, the issuer must have a stable public key pair to perform signing. To start the issuance process, a single 32-byte random Shared Secret must first be generated. This value will be shared privately with the holder as part of the issuer's JWP proof value.

The Shared Secret is used by both the issuer and holder as the MAC method's key to generate a new set of unique ephemeral keys. These keys are then used as the input to generate a MAC that protects each payload.

6.4.3. Combined MAC Representation

The combined MAC representation is a single octet string representing the MAC values of the issuer protected header, along with each payload provided by the issuer. This representation is signed by the issuer, but not shared - parties will recreate this octet string and verify the signature to verify the integrity of supplied issuer protected header and the integrity of any disclosed payloads.

The steps below describe a sequential concatenation of binary values to generate the Combined MAC Representation. The instructions for generating this octet string will also generate well-formed CBOR, although this data is not meant to be shared outside the implementing algorithm. Instead, it focuses on simplicity of generation by the issuer, holder, and verifier implementations. Although CBOR has multiple representations of the same underlying information, this same octet string MUST be generated by an implementation.

When a length or count is added by steps in this section, it is added as its 8-byte, network-ordered representation. For example, the length of a 1,234-byte payload would have a length representation of 0x00 00 00 00 00 00 04 D2.

The holder will a unique key per payload value using a MAC, with the Shared Secret as the key and a generated binary value. This binary value is constructed by appending data into a single octet string:

  1. 0x82 67 70 61 79 6C 6F 61 64 1B
  2. The zero indexed count of the payload slot

The holder will also compute a corresponding MAC of each payload. This MAC uses the unique key above and the payload octet string as the value.

When verifying a presentation, the shared secret will be unavailable so the unique key cannot be calculated. The payload octet string may also be omitted in the presentation. The following instructions describe how to get the corresponding MAC of each payload:

  • If the payload is disclosed, the corresponding proof component (as described in MAC Presentation Proof) will contain the generated unique key. The payload MAC will be calculated using this key and the payload octets as the value.
  • If the payload is not disclosed, the corresponding proof component will be the payload MAC.

The binary representation is created by appending data into a single octet string in the following order:

  1. 0x82 5B
  2. The length and octets of the issuer protected header
  3. 0x9B
  4. The number of payload slots in the issued JWP
  5. For each payload representation:

    1. 0x5B
    2. The length and value of the per payload MAC

6.4.4. Issuer Protected Header

The Holder's Presentation Key MUST be included via the Presentation Key header parameter.

The Holder's Presentation Algorithm MUST be included via the Holder Presentation Algorithm header parameter unless there is another way for the holder and verifier to unambiguously determine the appropriate algorithm to use.

6.4.5. Issuer Proof

The issuer proof consists of two octet strings.

The first octet string is the issuer signature over the combined MAC representation. The issuer signs the combined MAC representation using its stable public key, and the internal signing algorithm for the given fully-specified MAC algorithm variant.

The second octet string is the Shared Secret used to generate the per-payload keys for the combined representation.

6.4.6. Presentation Protected Header

See the Presentation Protected Header section given for Single Use algorithms.

6.4.7. Presentation Proof

The presentation proof is made of multiple components.

The first proof component is the issuer signature over the Combined MAC Representation, which is provided as the first proof component from the issued form.

There will now be one proof component per payload slot in the issued JWP. These are used by the verifier to reconstruct the combined MAC representation without access to the Shared Secret. The proof components are calculated per the instructions used to generate the Combined MAC Representation

If a payload is disclosed, the corresponding proof component will be the unique key.

If a payload is not disclosed, the corresponding proof component will be the payload's MAC (using the unique key.)

The holder protected header, issuer protected header, payload slots (distinguishing which are being disclosed) and above proof components are inputs to determine the presentation internal representation.

The holder's signature over the presentation internal representation (using the holder's private key and the holder presentation algorithm) is then included as one additional proof component in the final presentation.

The presented form should have two more proof components than payload slots in the issued JWP.

Note that the second component of the issued JWP is a shared secret for use by the holder to generate the unique keys used in the Combined MAC Representation. This MUST NOT be included in the presentation.

6.4.8. Verification of the Presentation Proof

Verification is performed using the following steps.

  1. Check the number of proof components is appropriate for the number of disclosed payloads. There MUST be two more proof components than disclosed payloads.
  2. Using the fully-specified MAC algorithm in use, use the issuer protected header, disclosed payloads, and the proof components corresponding to the payloads to regenerate the Combined MAC Representation.
  3. Verify the first proof component is a valid signature over the issuer protected header octets, using the issuer's stable key.
  4. Extract the presentation key and holder presentation algorithm (if present) from the issuer protected header.
  5. Omitting the final payload component, calculate the presentation internal representation.
  6. Verify the final proof component is a valid signature over the presentation internal binary form, using the holder's presentation key and the extracted (or otherwise determined) holder presentation algorithm.

6.4.9. JPA Registration

Proposed JWP alg value is of the format "MAC-" appended with a unique identifier for the set of MAC and signing algorithms used. Below are the initial registrations:

  • MAC-H256 uses HMAC SHA-256 as the MAC and ECDSA using P-256 and SHA-256 for the signatures
  • MAC-H384 uses HMAC SHA-384 as the MAC and ECDSA using P-384 and SHA-384 for the signatures
  • MAC-H512 uses HMAC SHA-512 as the MAC and ECDSA using P-521 and SHA-512 for the signatures
  • MAC-K25519 uses KMAC SHAKE128 as the MAC and EdDSA using Curve25519 for the signatures
  • MAC-K448 uses KMAC SHAKE256 as the MAC and EdDSA using Curve448 for the signatures
  • MAC-H256K uses HMAC SHA-256 as the MAC and ECDSA using secp256k1 and SHA-256 for the signatures

7. Security Considerations

Editor's Note: This will follow once the algorithms defined here have become more stable.

8. IANA Considerations

The following registration procedure is used for all the registries established by this specification.

Values are registered on a Specification Required [RFC5226] basis after a three-week review period on the jose-reg-review@ietf.org mailing list, on the advice of one or more Designated Experts. However, to allow for the allocation of values prior to publication, the Designated Experts may approve registration once they are satisfied that such a specification will be published.

Registration requests sent to the mailing list for review should use an appropriate subject (e.g., "Request to register JWP algorithm: example").

Within the review period, the Designated Experts will either approve or deny the registration request, communicating this decision to the review list and IANA. Denials should include an explanation and, if applicable, suggestions as to how to make the request successful. Registration requests that are undetermined for a period longer than 21 days can be brought to the IESG's attention (using the iesg@ietf.org mailing list) for resolution.

Criteria that should be applied by the Designated Experts include determining whether the proposed registration duplicates existing functionality, whether it is likely to be of general applicability or useful only for a single application, and whether the registration description is clear.

IANA must only accept registry updates from the Designated Experts and should direct all requests for registration to the review mailing list.

It is suggested that multiple Designated Experts be appointed who are able to represent the perspectives of different applications using this specification, in order to enable broadly informed review of registration decisions. In cases where a registration decision could be perceived as creating a conflict of interest for a particular Expert, that Expert should defer to the judgment of the other Experts.

8.1. JSON Web Proof Algorithms Registry

This specification establishes the IANA "JSON Web Proof Algorithms" registry for values of the JWP alg (algorithm) parameter in JWP Header Parameters. The registry records the algorithm name, the algorithm description, the algorithm usage locations, the implementation requirements, the change controller, and a reference to the specification that defines it. The same algorithm name can be registered multiple times, provided that the sets of usage locations are disjoint.

It is suggested that the length of the key be included in the algorithm name when multiple variations of algorithms are being registered that use keys of different lengths and the key lengths for each need to be fixed (for instance, because they will be created by key derivation functions). This allows readers of the JSON text to more easily make security decisions.

The Designated Experts should perform reasonable due diligence that algorithms being registered either are currently considered cryptographically credible or are being registered as Deprecated or Prohibited.

The implementation requirements of an algorithm may be changed over time as the cryptographic landscape evolves, for instance, to change the status of an algorithm to Deprecated or to change the status of an algorithm from Optional to Recommended+ or Required. Changes of implementation requirements are only permitted on a Specification Required basis after review by the Designated Experts, with the new specification defining the revised implementation requirements level.

8.1.1. Registration Template

Algorithm Name:
Brief descriptive name of the algorithm (e.g., Single-Use JWP using ES256.) Descriptive names may not match other registered names unless the Designated Experts state that there is a compelling reason to allow an exception.
Algorithm JSON Label:
The string label requested (e.g., SU-ES256). This label is a case-sensitive ASCII string. JSON Labels may not match other registered labels in a case-insensitive manner unless the Designated Experts state that there is a compelling reason to allow an exception.
Algorithm CBOR Label:
The integer label requested (e.g., 1). CBOR Labels may not match other registered labels unless the Designated Experts state that there is a compelling reason to allow an exception.
Algorithm Description:
Optional additional information clarifying the algorithm. This may be used for example to document additional chosen parameters.
Algorithm Usage Location(s):
The algorithm usage locations, which should be one or more of the values Issued or Presented. Other values may be used with the approval of a Designated Expert.
JWP Implementation Requirements:
The algorithm implementation requirements for JWP, which must be one the words Required, Recommended, Optional, Deprecated, or Prohibited. Optionally, the word can be followed by a + or -. The use of + indicates that the requirement strength is likely to be increased in a future version of the specification. The use of - indicates that the requirement strength is likely to be decreased in a future version of the specification. Any identifiers registered for algorithms that are otherwise unsuitable for direct use as JWP algorithms must be registered as Prohibited.
Change Controller:
For Standards Track RFCs, list the "IETF". For others, give the name of the responsible party. Other details (e.g., postal address, email address, home page URI) may also be included.
Specification Document(s):
Reference to the document or documents that specify the parameter, preferably including URIs that can be used to retrieve copies of the documents. An indication of the relevant sections may also be included but is not required.
Algorithm Analysis Documents(s):
References to a publication or publications in well-known cryptographic conferences, by national standards bodies, or by other authoritative sources analyzing the cryptographic soundness of the algorithm to be registered. The Designated Experts may require convincing evidence of the cryptographic soundness of a new algorithm to be provided with the registration request unless the algorithm is being registered as Deprecated or Prohibited. Having gone through working group and IETF review, the initial registrations made by this document are exempt from the need to provide this information.

8.1.2. Initial Registry Contents

8.1.2.1. Single-Use JWP using ES256 Algorithm
  • Algorithm Name: Single-Use JWP using ES256
  • Algorithm JSON Label: SU-ES256
  • Algorithm CBOR Label: 1
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Recommended
  • Change Controller: IETF
  • Specification Document(s): Section 6.1.11 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.2. Single-Use JWP using ES384 Algorithm
  • Algorithm Name: Single-Use JWP using ES384
  • Algorithm JSON Label: SU-ES384
  • Algorithm CBOR Label: 2
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.1.11 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.3. Single-Use JWP using ES512 Algorithm
  • Algorithm Name: Single-Use JWP using ES512
  • Algorithm JSON Label: SU-ES512
  • Algorithm CBOR Label: 3
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.1.11 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.4. BBS using SHA-256 Algorithm
  • Algorithm Name: BBS using SHA-256
  • Algorithm JSON Label: BBS
  • Algorithm CBOR Label: 4
  • Algorithm Description: Corresponds to a ciphersuite identifier of BBS_BLS12381G1_XMD:SHA-256_SSWU_RO_H2G_HM2S_
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Required
  • Change Controller: IETF
  • Specification Document(s): Section 6.3.1 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.5. MAC-H256 Algorithm
  • Algorithm Name: MAC-H256
  • Algorithm JSON Label: MAC-H256
  • Algorithm CBOR Label: 5
  • Algorithm Description: MAC-H256 uses HMAC SHA-256 as the MAC, and ECDSA using P-256 and SHA-256 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.6. MAC-H384 Algorithm
  • Algorithm Name: MAC-H384
  • Algorithm JSON Label: MAC-H384
  • Algorithm CBOR Label: 6
  • Algorithm Description: MAC-H384 uses HMAC SHA-384 as the MAC, and ECDSA using P-384 and SHA-384 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.7. MAC-H512 Algorithm
  • Algorithm Name: MAC-H512
  • Algorithm JSON Label: MAC-H512
  • Algorithm CBOR Label: 7
  • Algorithm Description: MAC-H512 uses HMAC SHA-512 as the MAC, and ECDSA using P-521 and SHA-512 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.8. MAC-K25519 Algorithm
  • Algorithm Name: MAC-K25519
  • Algorithm JSON Label: MAC-K25519
  • Algorithm CBOR Label: 8
  • Algorithm Description: MAC-K25519 uses KMAC SHAKE128 as the MAC, and EdDSA using Curve25519 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.9. MAC-K448 Algorithm
  • Algorithm Name: MAC-K448
  • Algorithm JSON Label: MAC-K448
  • Algorithm CBOR Label: 9
  • Algorithm Description: MAC-K448 uses KMAC SHAKE256 as the MAC, and EdDSA using Curve448 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a
8.1.2.10. MAC-H256K Algorithm
  • Algorithm Name: MAC-H256K
  • Algorithm JSON Label: MAC-H256K
  • Algorithm CBOR Label: 10
  • Algorithm Description: MAC-H256K uses HMAC SHA-256 as the MAC, and ECDSA using secp256k1 and SHA-256 for the signatures
  • Algorithm Usage Location(s): Issued, Presented
  • JWP Implementation Requirements: Optional
  • Change Controller: IETF
  • Specification Document(s): Section 6.4.9 of this specification
  • Algorithm Analysis Documents(s): n/a

9. References

9.1. Normative References

[I-D.ietf-jose-json-web-proof]
Waite, D., Jones, M. B., and J. Miller, "JSON Web Proof", Work in Progress, Internet-Draft, draft-ietf-jose-json-web-proof-latest, <https://datatracker.ietf.org/doc/html/draft-ietf-jose-json-web-proof>.
[I-D.irtf-cfrg-bbs-signatures]
Looker, T., Kalos, V., Whitehead, A., and M. Lodder, "The BBS Signature Scheme", Work in Progress, Internet-Draft, draft-irtf-cfrg-bbs-signatures-08, , <https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-bbs-signatures-08>.
[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/info/rfc2119>.
[RFC7515]
Jones, M., Bradley, J., and N. Sakimura, "JSON Web Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, , <https://www.rfc-editor.org/info/rfc7515>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/info/rfc8174>.

9.2. Informative References

[I-D.ietf-cbor-edn-literals]
Bormann, C., "CBOR Extended Diagnostic Notation (EDN)", Work in Progress, Internet-Draft, draft-ietf-cbor-edn-literals-17, , <https://datatracker.ietf.org/doc/html/draft-ietf-cbor-edn-literals-17>.
[I-D.ietf-cose-bls-key-representations]
Looker, T. and M. B. Jones, "Barreto-Lynn-Scott Elliptic Curve Key Representations for JOSE and COSE", Work in Progress, Internet-Draft, draft-ietf-cose-bls-key-representations-06, , <https://datatracker.ietf.org/doc/html/draft-ietf-cose-bls-key-representations-06>.
[I-D.maldant-spice-oidc-cwt]
Maldant, B., "OpenID Connect standard claims registration for CBOR Web Tokens", Work in Progress, Internet-Draft, draft-maldant-spice-oidc-cwt-02, , <https://datatracker.ietf.org/doc/html/draft-maldant-spice-oidc-cwt-02>.
[RFC2104]
Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-Hashing for Message Authentication", RFC 2104, DOI 10.17487/RFC2104, , <https://www.rfc-editor.org/info/rfc2104>.
[RFC5226]
Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", RFC 5226, DOI 10.17487/RFC5226, , <https://www.rfc-editor.org/info/rfc5226>.
[RFC7518]
Jones, M., "JSON Web Algorithms (JWA)", RFC 7518, DOI 10.17487/RFC7518, , <https://www.rfc-editor.org/info/rfc7518>.
[VC-DATA-MODEL-2.0]
Sporny, M., Jr, T. T., Herman, I., Cohen, G., and M. B. Jones, "Verifiable Credentials Data Model v2.0", , <https://www.w3.org/TR/vc-data-model-2.0>.

Appendix A. Example JWPs

The following examples use algorithms defined in JSON Proof Algorithms and also contain the keys used, so that implementations can validate these samples.

A.1. Example JSON-Serialized Single-Use JWP

This example uses the Single-Use Algorithm as defined in JSON Proof Algorithms to create a JSON Proof Token. It demonstrates how to apply selective disclosure using an array of traditional JWS-based signatures. Unlinkability is only achieved by using each JWP one time, as multiple uses are inherently linkable via the traditional ECDSA signature embedded in the proof.

To begin, we need two asymmetric keys for Single Use: one that represents the JPT Issuer's stable key and the other is an ephemeral key generated by the Issuer just for this JWP.

This is the Issuer's stable private key used in this example in the JWK format:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "CjQT-6UFgeCkSwhPKCz91z63-DP3NjTEDfGycP8wf5I",
  "y": "BTh7iHcxuQ8jPGUYfHq_KIheUmimJXYPR-m1BWsECvk",
  "d": "DL2kakbacqy6xY0MLmcIe-mlKjk1SNO6DCR2buUh6Rc"
}

Figure 1: Issuer Private Key (ES256 in JWK)

This is the ephemeral private key used in this example in the JWK format:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "cxyhUARWJloiJ0CZu3uAKh7EdYScec5QbaX7yrU8vnk",
  "y": "yPwCmwq3SJvm0xxJifmwHfF6aamzpezFOMPdNC91IKI",
  "d": "qGvgYEu2L8b59iWh4Wnl3dzPkSU4A11nM2-8eUzW_G0"
}

Figure 2: Issuer Ephemeral Private Key (ES256 in JWK)

This is the Holder's presentation private key used in this example in the JWK format:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "FBJGBtvNlRZ2xI99rcY8vnOlb0uKTr8cUGFeLRhQwv0",
  "y": "Sh9RTje1h2c4fcYmQNyQhk6okXf47nzuSaZ7y3JPi28",
  "d": "fuJNhqB6JoZFP5KQ8OIi0b3jMaoCV3lRcaQ5xXNnhCs"
}

Figure 3: Holder Presentation Private Key (ES256 in JWK)

The JWP Protected Header declares that the data structure is a JPT and the JWP Proof Input is secured using the Single-Use ECDSA algorithm with the P-256 curve and SHA-256 digest. It also includes the ephemeral public key, the Holder's presentation public key and list of claims used for this JPT.

{
  "alg": "SU-ES256",
  "typ": "JPT",
  "iss": "https://issuer.example",
  "hpa": "ES256",
  "claims": [
    "iat",
    "exp",
    "family_name",
    "given_name",
    "email",
    "address",
    "age_over_21"
  ],
  "proof_key": {
    "kty": "EC",
    "crv": "P-256",
    "x": "cxyhUARWJloiJ0CZu3uAKh7EdYScec5QbaX7yrU8vnk",
    "y": "yPwCmwq3SJvm0xxJifmwHfF6aamzpezFOMPdNC91IKI"
  },
  "presentation_key": {
    "kty": "EC",
    "crv": "P-256",
    "x": "FBJGBtvNlRZ2xI99rcY8vnOlb0uKTr8cUGFeLRhQwv0",
    "y": "Sh9RTje1h2c4fcYmQNyQhk6okXf47nzuSaZ7y3JPi28"
  }
}

Figure 4: Issuer Protected header (SU-ES256, JSON)
eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8vaXNzdWVyL
mV4YW1wbGUiLCJocGEiOiJFUzI1NiIsImNsYWltcyI6WyJpYXQiLCJleHAiLCJmYW1pbH
lfbmFtZSIsImdpdmVuX25hbWUiLCJlbWFpbCIsImFkZHJlc3MiLCJhZ2Vfb3Zlcl8yMSJ
dLCJwcm9vZl9rZXkiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOiJjeHloVUFS
V0psb2lKMENadTN1QUtoN0VkWVNjZWM1UWJhWDd5clU4dm5rIiwieSI6InlQd0Ntd3EzU
0p2bTB4eEppZm13SGZGNmFhbXpwZXpGT01QZE5DOTFJS0kifSwicHJlc2VudGF0aW9uX2
tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwieCI6IkZCSkdCdHZObFJaMnhJOTl
yY1k4dm5PbGIwdUtUcjhjVUdGZUxSaFF3djAiLCJ5IjoiU2g5UlRqZTFoMmM0ZmNZbVFO
eVFoazZva1hmNDduenVTYVo3eTNKUGkyOCJ9fQ

Figure 5: Encoded Issuer Protected Header (SU-ES256, JSON, encoded)

The Single Use algorithm utilizes multiple individual JWS Signatures. Each signature value is generated by creating a JWS with a single Protected Header with the associated alg value. In this example, the fixed header used for each JWS is the serialized JSON Object {"alg":"ES256"}. This protected header will be used to generate a signature over each corresponding payload in the JWP. The corresponding octet value in the proof is the octet string (base64url-decoded) value of the signature.

The final proof value from the Issuer is an array with the octets of the header signature, followed by entries for each payload signature.

[
    1714521600,
    1717199999,
    "Doe",
    "Jay",
    "jaydoe@example.org",
    {
        "formatted": "1234 Main St.\nAnytown, CA 12345\nUSA",
        "street_address": "1234 Main St.",
        "locality": "Anytown",
        "region": "CA",
        "postal_code": 12345,
        "country": "USA"
    },
    true
]

Figure 6: Issuer payloads (JSON, as array)

The compact serialization of the same JPT is:
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.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~
IkRvZSI~IkpheSI~ImpheWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0I
E1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOi
IxMjM0IE1haW4gU3QuIiwibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJ
wb3N0YWxfY29kZSI6MTIzNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ.DrU_Xk-G3TvrUO
yWumXBe55pP-zdRxyerL7KiYfpj_1QI1LCnROHijfsjQg5i0yjfUZMwTbrGtMe-uk50C7
j8w~byqEGdmorfzmbfDO5-IFOrk0dyoRp4IkFm7lHijSDAcNHFxO-go_Fbal7ADWz-Bk7
vvn1JPHSQjf801IXWenzA~S9A38_P4Hs140trOM3lfL2O_GHPseK7-nHTWqjvV3eq8sT_
EaGtCJW5wmaZ5hOuN8hsDgCpvdC6yRFqnD-GAzQ~k25-DWabu4ZvXlZNJDXEmW9TC4q2Q
YoBrkHxYt3ZfkK3dinMb2HQErBb1Vnx5RKi9SBjcxv3P_D2OprSsf7qwQ~mRbB52gzXUg
hAcqexn_AKntKoaQQ_vS6ZiixzV63xrjJlxE6igENc1LmesymXqzNSV_1yuFhwU11CCuD
m7CVxQ~xw7XwyKN-dhYpcFH_xdHY8buKDKmdhJ5H1YTPzgvDRTamllQkwfaaPeROoRFWc
oZGn6mGk-kGsRrisdwK67ftw~uGP17eRVPw9G8EFPXwfZGxvWmbDYiIjUryXt08Gh8xFp
cgsxYp5PE99lxl0QKJAprt-DapMpteLb8l3U6cb6aQ~zHQe0kXcxQ9SqAhFfbXM-mBHir
IOdVKAH5IQtQnJCD5JwiSzm9Y1eQ4Xbft4E02vKzqFKJdabhzPXWXNVZ4w5g

Figure 7: Issued JWP (SU-ES256, JSON, Compact Serialization)

To present this JPT, we first use the following presentation header with a nonce (provided by the Verifier):

{
  "alg": "SU-ES256",
  "aud": "https://recipient.example.com",
  "nonce": "FHoPLbxa8T4ml0upmSTLTJoyhPJSJTH6Sc3n7Xdl1Rw"
}

Figure 8: Presentation Header (SU-ES256, JSON)
eyJhbGciOiJTVS1FUzI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY
29tIiwibm9uY2UiOiJGSG9QTGJ4YThUNG1sMHVwbVNUTFRKb3loUEpTSlRINlNjM243WG
RsMVJ3In0

Figure 9: Presentation Header (SU-ES256, JSON, Base64url-Encoded)

We apply selective disclosure of only the given name and age claims (family name and email hidden), and remove the proof components corresponding to these entries.

Using the selectively disclosed information, we generate the presentation internal representation. Using that and the selectively disclosed payloads, we get the following presented JPT in compact serialization:

eyJhbGciOiJTVS1FUzI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY
29tIiwibm9uY2UiOiJGSG9QTGJ4YThUNG1sMHVwbVNUTFRKb3loUEpTSlRINlNjM243WG
RsMVJ3In0.eyJhbGciOiJTVS1FUzI1NiIsInR5cCI6IkpQVCIsImlzcyI6Imh0dHBzOi8
vaXNzdWVyLmV4YW1wbGUiLCJocGEiOiJFUzI1NiIsImNsYWltcyI6WyJpYXQiLCJleHAi
LCJmYW1pbHlfbmFtZSIsImdpdmVuX25hbWUiLCJlbWFpbCIsImFkZHJlc3MiLCJhZ2Vfb
3Zlcl8yMSJdLCJwcm9vZl9rZXkiOnsia3R5IjoiRUMiLCJjcnYiOiJQLTI1NiIsIngiOi
JjeHloVUFSV0psb2lKMENadTN1QUtoN0VkWVNjZWM1UWJhWDd5clU4dm5rIiwieSI6Inl
Qd0Ntd3EzU0p2bTB4eEppZm13SGZGNmFhbXpwZXpGT01QZE5DOTFJS0kifSwicHJlc2Vu
dGF0aW9uX2tleSI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwieCI6IkZCSkdCdHZOb
FJaMnhJOTlyY1k4dm5PbGIwdUtUcjhjVUdGZUxSaFF3djAiLCJ5IjoiU2g5UlRqZTFoMm
M0ZmNZbVFOeVFoazZva1hmNDduenVTYVo3eTNKUGkyOCJ9fQ.MTcxNDUyMTYwMA~MTcxN
zE5OTk5OQ~IkRvZSI~IkpheSI~ImpheWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQ
iOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2Fk
ZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uI
joiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ~~.Dr
U_Xk-G3TvrUOyWumXBe55pP-zdRxyerL7KiYfpj_1QI1LCnROHijfsjQg5i0yjfUZMwTb
rGtMe-uk50C7j8w~byqEGdmorfzmbfDO5-IFOrk0dyoRp4IkFm7lHijSDAcNHFxO-go_F
bal7ADWz-Bk7vvn1JPHSQjf801IXWenzA~S9A38_P4Hs140trOM3lfL2O_GHPseK7-nHT
WqjvV3eq8sT_EaGtCJW5wmaZ5hOuN8hsDgCpvdC6yRFqnD-GAzQ~k25-DWabu4ZvXlZNJ
DXEmW9TC4q2QYoBrkHxYt3ZfkK3dinMb2HQErBb1Vnx5RKi9SBjcxv3P_D2OprSsf7qwQ
~mRbB52gzXUghAcqexn_AKntKoaQQ_vS6ZiixzV63xrjJlxE6igENc1LmesymXqzNSV_1
yuFhwU11CCuDm7CVxQ~xw7XwyKN-dhYpcFH_xdHY8buKDKmdhJ5H1YTPzgvDRTamllQkw
faaPeROoRFWcoZGn6mGk-kGsRrisdwK67ftw~mmBtfn3TaQWWiD2m0fiM5K-5QEZbkQjq
akMkb2vcgIdoOQb5M0TCUilW7t0THMKnXQ5R1xjcQyetx2eyywDvdg

Figure: Presentation (SU-ES256, JSON, Compact Serialization)

A.2. Example CBOR-Serialized Single-Use CPT

This example is meant to mirror the prior compact serialization, using RFC8392 and claims from [I-D.maldant-spice-oidc-cwt], illustrated using [I-D.ietf-cbor-edn-literals] (EDN).

To simplify this example, the same information is represented as the JPT example above, including the same public and private keys.

{          / protected header /
  1: 1,     / alg: "SU-ES256" /
  3: 20,    / typ: "JPT" (20CPA) /
  5: "https://issuer.example",  / iss: "https://issuer.example" /
  6: [      / claims /
    6,      / "iat" /
    4,      / "exp" /
    170,    / "family_name" (I-D.maldant-spice-oidc-cwt TBD1) /
    171,    / "given_name"  (I-D.maldant-spice-oidc-cwt TBD2) /
    179,    / "email"       (I-D.maldant-spice-oidc-cwt TBD10) /
    187,    / "address"     (I-D.maldant-spice-oidc-cwt TBD18) /
    "age_over_21"
  ],
  8: {      / proof key /
    1: 2,   / kty : "EC2" /
    -1: 1,  / crv: "P-256" /
    -2: h'14124606dbcd951676c48f7dadc63cbe73a56f4b8a4ebf1c50615e2d' +
        h'1850c2fd', / x /
    -3: h'4a1f514e37b58767387dc62640dc90864ea89177f8ee7cee49a67bcb' +
        h'724f8b6f'  / y /
  },
  9: {      / presentation key /
    1: 2,   / kty: "EC2" /
    -1: 1,  / crv: "P-256" /
    -2: h'731ca1500456265a22274099bb7b802a1ec475849c79ce506da5fbca' +
        h'b53cbe79', / x /
    -3: h'c8fc029b0ab7489be6d31c4989f9b01df17a69a9b3a5ecc538c3dd34' +
        h'2f7520a2'  / y /
  },
  10: -9    / hpa: "ESP256" (I-D.ietf-jose-fully-specified-algorithms TBD-9) /
}

Figure: Issuer Protected Header (SU-ES256, CBOR)

[ / payloads    /
  / iat         / 171452160,
  / exp         / 171719999,
  / family_name / "Doe",
  / given_name  / "Jay",
  / email       / "jaydoe@example.org",
  / address     / {
    / formatted / 1: "1234 Main St.\nAnytown, CA 12345\nUSA",
    / street    / 2: "1234 Main St.",
    / locality  / 3: "Anytown",
    / region    / 4: "CA",
    / post code / 5: "90210",
    / country   / 6: "USA"
  },
  / age_over_21 / true
]

Figure: Issuer Payloads (as CBOR array)

When signed and serialized, the CPT is represented by the following CBOR (in hex):

8358cfa701010314057668747470733a2f2f6973737565722e6578616d706c65
0687060418aa18ab18b318bb6b6167655f6f7665725f323108a4010220012158
2014124606dbcd951676c48f7dadc63cbe73a56f4b8a4ebf1c50615e2d1850c2
fd2258204a1f514e37b58767387dc62640dc90864ea89177f8ee7cee49a67bcb
724f8b6f09a401022001215820731ca1500456265a22274099bb7b802a1ec475
849c79ce506da5fbcab53cbe79225820c8fc029b0ab7489be6d31c4989f9b01d
f17a69a9b3a5ecc538c3dd342f7520a20a28871a0a3827001a0a3c3d3f63446f
65634a6179726a6179646f65406578616d706c652e6f7267a601782331323334
204d61696e2053742e0a416e79746f776e2c2043412031323334350a55534102
6d31323334204d61696e2053742e0367416e79746f776e046243410565393032
31300663555341f58858400ab637ea2959fb8f629e619ce37b9790ccc7707e3c
961ca17c294a6634860b1322ce4dc8d71440447716cdabe530058a031497ca6e
d811d6cb67a7541d8f7f005840af80f844a88fa79efc265d8a25294b015c508a
0a07231da0c8675f23e3d8b51bc073bd125e235f45091cbc9b5ac3c045552ff9
167d19453a9c07b0b995dc531558405851e0ea0f681e4bf4bc5bba85a1855bf9
8653a266e881e0a847f5501331709de91a3dabbe2ab2bb953b60f49fb4fc3622
e172013a9c5a177b971e19b9fd557658402dd0e8af3f49b6b258a189e660e37c
4d019a61232e9796bcbafebbee8605b6924ccc86cf2961cc1fd7882c4e0f1c2d
ee27be91c8935751b126ab0d76496e40cb5840f473381f426e977f6c3649460c
145d18b0e6d93cbdeeaad2972bbfa535ea4534443677685ec4129ee83aaaa775
af9c860d2b106c705637153a5101b490e5422e5840d8cf8d7f7e1c98c6bf98ce
54f25b30b337f03aa85346ada86b2dee8c113930de44240f4a184fa6f8a12082
c9f750a887a6192a1c6db40093f002adc06318bacd5840c53c976d5ee96934db
0fdee90e3f681b6fd987d728d9a6e08f1abcd73e17e79c9b58ab64c3fc9d5455
3d1704713a06ca18b47d069a0a43dc8c5a507cc91113d158401e535d8f4165fa
15dd0e62ca853f77d875e2dba413709b0f9c770f35b65781d612835b938d44e3
1410d7dae6b86daab5b1be374f2e8942e32fa9a8ddd8746d1f

Fixtures: Issued Form (SU-ES256, CBOR)

The presented form, similarly to the issued form above, is made with the holder conveying the same parameters and the same set of selectively disclosed payloads as the JPT above:

{          / protected header /
  1: 1,    / alg: "SU-ES256" /
  6: "https://recipient.example.com", / aud /
  7: h'147a0f2dbc5af13e26974ba99924cb4c9a3284f2522531fa49cde7ed7765d51c', / nonce /
}

Figure: Holder Protected Header (SU-ES256, CBOR)

When the appropriate proof is generated, the CPT is serialized into the following CBOR (in hex):

845846a3010106781d68747470733a2f2f726563697069656e742e6578616d70
6c652e636f6d075820147a0f2dbc5af13e26974ba99924cb4c9a3284f2522531
fa49cde7ed7765d51c58cfa701010314057668747470733a2f2f697373756572
2e6578616d706c650687060418aa18ab18b318bb6b6167655f6f7665725f3231
08a40102200121582014124606dbcd951676c48f7dadc63cbe73a56f4b8a4ebf
1c50615e2d1850c2fd2258204a1f514e37b58767387dc62640dc90864ea89177
f8ee7cee49a67bcb724f8b6f09a401022001215820731ca1500456265a222740
99bb7b802a1ec475849c79ce506da5fbcab53cbe79225820c8fc029b0ab7489b
e6d31c4989f9b01df17a69a9b3a5ecc538c3dd342f7520a20a28891a0a382700
1a0a3c3d3f63446f65634a6179726a6179646f65406578616d706c652e6f7267
a601782331323334204d61696e2053742e0a416e79746f776e2c204341203132
3334350a555341026d31323334204d61696e2053742e0367416e79746f776e04
624341056539303231300663555341f5f6f68758400ab637ea2959fb8f629e61
9ce37b9790ccc7707e3c961ca17c294a6634860b1322ce4dc8d71440447716cd
abe530058a031497ca6ed811d6cb67a7541d8f7f005840af80f844a88fa79efc
265d8a25294b015c508a0a07231da0c8675f23e3d8b51bc073bd125e235f4509
1cbc9b5ac3c045552ff9167d19453a9c07b0b995dc531558405851e0ea0f681e
4bf4bc5bba85a1855bf98653a266e881e0a847f5501331709de91a3dabbe2ab2
bb953b60f49fb4fc3622e172013a9c5a177b971e19b9fd557658402dd0e8af3f
49b6b258a189e660e37c4d019a61232e9796bcbafebbee8605b6924ccc86cf29
61cc1fd7882c4e0f1c2dee27be91c8935751b126ab0d76496e40cb5840f47338
1f426e977f6c3649460c145d18b0e6d93cbdeeaad2972bbfa535ea4534443677
685ec4129ee83aaaa775af9c860d2b106c705637153a5101b490e5422e5840d8
cf8d7f7e1c98c6bf98ce54f25b30b337f03aa85346ada86b2dee8c113930de44
240f4a184fa6f8a12082c9f750a887a6192a1c6db40093f002adc06318bacd58
406a7212fc53140a88d15cbf3f6153475765f858ef188bdf69bb09a7557a46b6
85b09422ea32c9a6f48f4bf09993a9f5cc740920c56b02c9ac4d08c52a47903f
c2

Figure: Presented Form (SU-ES256, CBOR)

A.3. Example BBS JWP

The following example uses the BBS algorithm.

This is the Issuer's stable private key in the JWK format:

{
  "kty": "EC2",
  "alg": "BBS",
  "use": "proof",
  "crv": "BLS12381G2",
  "x": "Brc1Lyig6vB5pPS-QdwNUXPgTytoLjEWfrUD60221yWXLJzCMi_yfBo6DbYDe
       w6wFbYzAE0m-_v_m5Y_HVWN-77vcHSAAThZyNVCn_euDSFfm2xQW68GgZNX21v
       GvSqJ",
  "y": "CnghVa6lETvcSRL2_RnvjkV7hnIcbXNSNybY-Q8utaAJ8vAiamKvj-7bfkCB8
       tcaBFqaMTi7xr54CYdQ3TY4eN25N1wakCutcixkRDy2mNMc47Kb95I90vqbhIw
       cweUA",
  "d": "VXM2Ops7LkhNKZNaO7AYqf4gGNbbmYYMrkAOBNG6C9E"
}

Figure 10: BBS private key in JWK format

There is no additional holder key necessary for presentation proofs.

For the following protected header and array of payloads:

{
  "kid": "HjfcpyjuZQ-O8Ye2hQnNbT9RbbnrobptdnExR0DUjU8",
  "alg": "BBS"
}

Figure 11: Example issuer protected header

These components are signed using the private issuer key previously given, which is then representable in the following serialization:

eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJUOVJiYm5yb2JwdGRuRXhSMERValU4I
iwiYWxnIjoiQkJTIn0.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~Imph
eWRvZUBleGFtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b
3duLCBDQSAxMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIi
wibG9jYWxpdHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTI
zNDUsImNvdW50cnkiOiJVU0EifQ~dHJ1ZQ.iFtSJODK2w0B20KN0H1vCuWrw6DlEI4eaL
1CSckoTfFBc-QWsM0TL7vT0i411RLQLGoiNhN_TdT2l9tqJ_GQyC6birG_60LCslbWrib
0uRY

Figure 12: Issued JWP (BBS, JSON, Compact Serialization)

For a presentation with the following presentation header:

{
    "alg": "BBS",
    "aud": "https://recipient.example.com",
    "nonce": "wrmBRkKtXjQ"
}

Figure 13: Holder Presentation Header

The holder decides to share all information other than the email address, and generates a proof. That proof is represented in the following serialization:

eyJhbGciOiJCQlMiLCJhdWQiOiJodHRwczovL3JlY2lwaWVudC5leGFtcGxlLmNvbSIsI
m5vbmNlIjoid3JtQlJrS3RYalEifQ.eyJraWQiOiJIamZjcHlqdVpRLU84WWUyaFFuTmJ
UOVJiYm5yb2JwdGRuRXhSMERValU4IiwiYWxnIjoiQkJTIn0.MTcxNDUyMTYwMA~MTcxN
zE5OTk5OQ~IkRvZSI~IkpheSI~~~.hseta9Fzo_xxDAQVQ_b6FwwTV_-HKTYJ4CHC0Zyo
C9xOQIGiIpzX7B1Y1IAzy2ZqkwAEuxdhGgJkjgtdROozxvTqJevvGLvBL_5Wm10tV-bnD
bEzfTVnoHzn0xo0ZJ1ErA2xv-r2izXUHdIad8eHfwAuZMHMVCdJGnJe5a5gU0_BQs58Tj
JnPY055xyhnrTdT5hwOZeEmPbG-18kAVSkksfZxjOuHGhsUzv3hiPfQh8TWwi4b_0EAEc
O_SEzieFn621saAcazdZ-4UkWBFqnoQgg6ClpcFWd0sFnlFPcECSlOoWtc0bbSrvV_AUk
ocNnRojJ0vzNfhJKa1e5-tZT00YtdMHshusau_i--pmv3bNmKhxppTHV7atsHa7GJOWSg
r0JPBNhxF2ZqfxnA51LlD9OHHP2LazNW3i170rne3nSTFXCVvWaTH55HuxOyQ79EywBWD
XPJvqBYPTe7ZHrocCwqzLpdIFz5rwCdGQTz0U

Figure 14: Presentation JWP (BBS, JSON, Compact serialization)

A.4. Example MAC JWP

The following example uses the MAC-H256 algorithm.

This is the Issuer's stable private key in the JWK format:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "CjQT-6UFgeCkSwhPKCz91z63-DP3NjTEDfGycP8wf5I",
  "y": "BTh7iHcxuQ8jPGUYfHq_KIheUmimJXYPR-m1BWsECvk",
  "d": "DL2kakbacqy6xY0MLmcIe-mlKjk1SNO6DCR2buUh6Rc"
}

Figure 15: Issuer private key

This is the Issuer's ephemerally generated shared secret:

"Tn6Km26x_Q004dHPKITtqmuDcbj9E0m-039iTTeWhNg"

Figure 16: Shared Secret

This is the Holder's presentation private key in the JWK format:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "FBJGBtvNlRZ2xI99rcY8vnOlb0uKTr8cUGFeLRhQwv0",
  "y": "Sh9RTje1h2c4fcYmQNyQhk6okXf47nzuSaZ7y3JPi28",
  "d": "fuJNhqB6JoZFP5KQ8OIi0b3jMaoCV3lRcaQ5xXNnhCs"
}

Figure 17: Holder private key

For the following protected header and array of payloads:

{
  "alg": "MAC-H256",
  "hpa": "ES256",
  "typ": "JPT",
  "iss": "https://issuer.example",
  "claims": [
    "iat",
    "exp",
    "family_name",
    "given_name",
    "email",
    "address",
    "age_over_21"
  ],
  "presentation_key": {
    "kty": "EC",
    "crv": "P-256",
    "use": "sign",
    "x": "FBJGBtvNlRZ2xI99rcY8vnOlb0uKTr8cUGFeLRhQwv0",
    "y": "Sh9RTje1h2c4fcYmQNyQhk6okXf47nzuSaZ7y3JPi28"
  }
}

Figure 18: Example issuer protected header
[
    1714521600,
    1717199999,
    "Doe",
    "Jay",
    "jaydoe@example.org",
    {
        "formatted": "1234 Main St.\nAnytown, CA 12345\nUSA",
        "street_address": "1234 Main St.",
        "locality": "Anytown",
        "region": "CA",
        "postal_code": 12345,
        "country": "USA"
    },
    true
]

Figure 19: Example issuer payloads (as members of a JSON array)

The issuer generates an array of derived keys, one per payload slot. This is done using the shared secret as the key and a binary value based on the payload slot index (from zero) as input to the HMAC operation.

This results in the following set of derived keys:

[
  "8Wpv1l72xSYNFj1RWyEcPdn-o8fHDP9c54e_IMhasYM",
  "OStmmU_62_b0ahFJA2pcOElDzU1eAL5rK_ryl58BMoE",
  "oTgd3_IysQaJqcVamyZuPuLbhXPxUafVRwa3kXX_iwQ",
  "7HUuRzjvEIUwA3O0EYcm_Ki6BdihrVUfEOKx4vF2b4c",
  "8i47Asv4de9RoLKbihuvYBYQ5M9ty0SuwFsBG7c1694",
  "c_O5kinb6HIx95UMhq5b7Ck-LU1kuTwTHxEzackdJZI",
  "CU7Oc9PKXVefKw8PszcZxpLK85KFmGYz369J-9qp2Uo"
]

Figure 20: Derived payload keys (Base64url-Encoded)

A MAC is generated for each payload using the corresponding derived payload key. This results in the following set of MAC values:

[
  "V6xE6JigqZUaBWb0eMRFwwZn5KzLwmOq9ultNbPy5mY",
  "zm6RUaZJCnO91UbRNfzoomzuq_Zxe1ANAvpYw77sORM",
  "ue_tKSdVz9XHaoT2TLrggd0oSnrvXdLIIV2RS4erIqU",
  "BHX1dChc-u-bYqT8S7vgxkWjLxAEJdOw8SeW0v27s8Y",
  "8dJVXsTeJpCScA1LR3zFaAbtEcf13P56HAFefftE8b4",
  "mJDNfW9HBAoOFfnRUNE0ZAkdSmG_gl1o91aaRHUEH6k",
  "BIARevJTrPfV7ttwA6i-xhVD_dFpSi53LElWgwvEtk8"
]

Figure 21: Payload MAC values (Base64url-Encoded)

The issuer protected header and payload MAC values are combined into a binary representation known as the Compact MAC Representation. This representation is signed with the issuer's private key.

The proof consists of two octet string values: the signature over the combined MAC representation, and the shared secret.

[
  "4_eCWXwCwcoyULj8GjynVePMEqHokmK2_VjyMsdS_nhyOxzWgVW7Ks3_BgKQL9233Z
VBKAAMT5JdPK_VhyZjFQ",
  "PWE8eCmWogA-WYJ2htcTxPcBxV9meU5ct4zdl2amXEU"
]

Figure 22: Issued Proof (Base64url-Encoded)

The final issued JWP in compact serialization is:

eyJhbGciOiJNQUMtSDI1NiIsImhwYSI6IkVTMjU2IiwidHlwIjoiSlBUIiwiaXNzIjoia
HR0cHM6Ly9pc3N1ZXIuZXhhbXBsZSIsImNsYWltcyI6WyJpYXQiLCJleHAiLCJmYW1pbH
lfbmFtZSIsImdpdmVuX25hbWUiLCJlbWFpbCIsImFkZHJlc3MiLCJhZ2Vfb3Zlcl8yMSJ
dLCJwcmVzZW50YXRpb25fa2V5Ijp7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNTYiLCJ1c2Ui
OiJzaWduIiwieCI6IkZCSkdCdHZObFJaMnhJOTlyY1k4dm5PbGIwdUtUcjhjVUdGZUxSa
FF3djAiLCJ5IjoiU2g5UlRqZTFoMmM0ZmNZbVFOeVFoazZva1hmNDduenVTYVo3eTNKUG
kyOCJ9fQ.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~ImpheWRvZUBleG
FtcGxlLm9yZyI~eyJmb3JtYXR0ZWQiOiIxMjM0IE1haW4gU3QuXG5Bbnl0b3duLCBDQSA
xMjM0NVxuVVNBIiwic3RyZWV0X2FkZHJlc3MiOiIxMjM0IE1haW4gU3QuIiwibG9jYWxp
dHkiOiJBbnl0b3duIiwicmVnaW9uIjoiQ0EiLCJwb3N0YWxfY29kZSI6MTIzNDUsImNvd
W50cnkiOiJVU0EifQ~dHJ1ZQ.4_eCWXwCwcoyULj8GjynVePMEqHokmK2_VjyMsdS_nhy
OxzWgVW7Ks3_BgKQL9233ZVBKAAMT5JdPK_VhyZjFQ~PWE8eCmWogA-WYJ2htcTxPcBxV
9meU5ct4zdl2amXEU

Figure 23: Issued JWP (MAC-H256, JSON, Compact Serialization)

Next, we show the presentation of the JWP with selective disclosure.

For presentation with the following presentation protected header:

{
  "alg": "MAC-H256",
  "aud": "https://recipient.example.com",
  "nonce": "FHoPLbxa8T4ml0upmSTLTJoyhPJSJTH6Sc3n7Xdl1Rw"
}

Figure 24: Presentation Protected Header

The holder will take the issuer proof (including shared secret) and derive the same individual payload MAC values (above).

In this case, the holder has decided not to disclose the last three claims provided by the issuer (corresponding to email, address, and age_over_21)

For each payload slot, the holder will provide one of two values as part of the proof value. For a disclosed payload, the holder will provide the corresponding derived key. For a non-disclosed payload, the holder will provide the corresponding MAC value.

The final presented proof value is an array of octet strings. The contents are presentation header signature, followed by the issuer signature, then the value disclosed by the holder for each payload. This results in the following proof:

[
  "4_eCWXwCwcoyULj8GjynVePMEqHokmK2_VjyMsdS_nhyOxzWgVW7Ks3_BgKQL9233Z
VBKAAMT5JdPK_VhyZjFQ",
  "8Wpv1l72xSYNFj1RWyEcPdn-o8fHDP9c54e_IMhasYM",
  "OStmmU_62_b0ahFJA2pcOElDzU1eAL5rK_ryl58BMoE",
  "oTgd3_IysQaJqcVamyZuPuLbhXPxUafVRwa3kXX_iwQ",
  "7HUuRzjvEIUwA3O0EYcm_Ki6BdihrVUfEOKx4vF2b4c",
  "8dJVXsTeJpCScA1LR3zFaAbtEcf13P56HAFefftE8b4",
  "mJDNfW9HBAoOFfnRUNE0ZAkdSmG_gl1o91aaRHUEH6k",
  "BIARevJTrPfV7ttwA6i-xhVD_dFpSi53LElWgwvEtk8",
  "t-ETkre5rEzV0cL0W-eVVkuG215bhi-3GLvcrIsrEJC4IcTQB8RCp7cX_pwXfPfHY6
nDy77YyF0H04cRG7dwKw"
]

Figure 25: Presentation proof (Base64url-Encoded)

The final presented JWP in compact serialization is:

eyJhbGciOiJNQUMtSDI1NiIsImF1ZCI6Imh0dHBzOi8vcmVjaXBpZW50LmV4YW1wbGUuY
29tIiwibm9uY2UiOiJGSG9QTGJ4YThUNG1sMHVwbVNUTFRKb3loUEpTSlRINlNjM243WG
RsMVJ3In0.eyJhbGciOiJNQUMtSDI1NiIsImhwYSI6IkVTMjU2IiwidHlwIjoiSlBUIiw
iaXNzIjoiaHR0cHM6Ly9pc3N1ZXIuZXhhbXBsZSIsImNsYWltcyI6WyJpYXQiLCJleHAi
LCJmYW1pbHlfbmFtZSIsImdpdmVuX25hbWUiLCJlbWFpbCIsImFkZHJlc3MiLCJhZ2Vfb
3Zlcl8yMSJdLCJwcmVzZW50YXRpb25fa2V5Ijp7Imt0eSI6IkVDIiwiY3J2IjoiUC0yNT
YiLCJ1c2UiOiJzaWduIiwieCI6IkZCSkdCdHZObFJaMnhJOTlyY1k4dm5PbGIwdUtUcjh
jVUdGZUxSaFF3djAiLCJ5IjoiU2g5UlRqZTFoMmM0ZmNZbVFOeVFoazZva1hmNDduenVT
YVo3eTNKUGkyOCJ9fQ.MTcxNDUyMTYwMA~MTcxNzE5OTk5OQ~IkRvZSI~IkpheSI~~~.4
_eCWXwCwcoyULj8GjynVePMEqHokmK2_VjyMsdS_nhyOxzWgVW7Ks3_BgKQL9233ZVBKA
AMT5JdPK_VhyZjFQ~8Wpv1l72xSYNFj1RWyEcPdn-o8fHDP9c54e_IMhasYM~OStmmU_6
2_b0ahFJA2pcOElDzU1eAL5rK_ryl58BMoE~oTgd3_IysQaJqcVamyZuPuLbhXPxUafVR
wa3kXX_iwQ~7HUuRzjvEIUwA3O0EYcm_Ki6BdihrVUfEOKx4vF2b4c~8dJVXsTeJpCScA
1LR3zFaAbtEcf13P56HAFefftE8b4~mJDNfW9HBAoOFfnRUNE0ZAkdSmG_gl1o91aaRHU
EH6k~BIARevJTrPfV7ttwA6i-xhVD_dFpSi53LElWgwvEtk8~t-ETkre5rEzV0cL0W-eV
VkuG215bhi-3GLvcrIsrEJC4IcTQB8RCp7cX_pwXfPfHY6nDy77YyF0H04cRG7dwKw

Figure 26: Presented JWP (MAC-H256, JSON, Compact Serialization)

Appendix B. Acknowledgements

This work was incubated in the DIF Applied Cryptography Working Group.

We would like to thank Alberto Solavagione for his valuable contributions to this specification.

The BBS examples were generated using the library at https://github.com/mattrglobal/pairing_crypto .

Appendix C. Document History

[[ To be removed from the final specification ]]

-10

-09

-08

-07

-06

-05

-04

-03

-02

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Authors' Addresses

Michael B. Jones
Self-Issued Consulting
David Waite
Ping Identity
Jeremie Miller
Ping Identity