2024-02-12 AnonCreds Working Group Meeting

Summary

• AnonCreds in W3C Format - Status Update / Issues
• AnonCreds 0.2.0 Release – contents
• AnonCreds Release 1.0.0
• AnonCreds v2 Objects – verifiable encryption, equality proofs and domain proofs
• Open Discussion

Time: 7:00 Pacific / 16:00 Central Europe
Call Link: https://zoom.us/j/97954159540?pwd=WWk3WmQ3MVh1SXBYZGVreGl0QllGdz09

Recording: 

Notices: 

This specification creating group operates under the Linux Foundation Community Specification License v1.0.

Meeting Attendees

Stephen Curran (BC Gov / Cloud Compass Computing Inc.) <swcurran@cloudcompass.ca>

Related Specifications and Repositories:

• AnonCreds v1.0:
  • The v1.0 specification is published here: https://hyperledger.github.io/anoncreds-spec/
  • The Working Group uses this GitHub repository to manage the specification: https://github.com/hyperledger/anoncreds-spec
  • The AnonCreds Methods Registry: https://hyperledger.github.io/anoncreds-methods-registry
  • The v1.0 implementation in Rust is here: https://github.com/hyperledger/anoncreds-rs
  • The v1.0 implementation is dependent on this Rust CL Signatures implementation: https://github.com/hyperledger/anoncreds-clsignatures-rs
• AnonCreds v2.0
  • The initial framework for the v2.0 specification repository is here: https://github.com/hyperledger/anoncreds-spec-v2
  • The v2.0 implementation in Rust is here: https://github.com/hyperledger/anoncreds-v2-rs
  • Underlying AnonCreds v2.0 are cryptographic libraries in Hyperledger Labs Agora

Meeting Preliminaries:

• Welcome and Introductions
• Announcements:
  • AnonCreds annual review at the ToC – this Thursday, February 15th – Meeting Notice
  • Workshop Weds April 24th: Zero Knowledge Proofs and ZK Programming in Blockchain Application Development
  • IIW – April 16-18, 2024
• Any updates to the Agenda?

Agenda

• AnonCreds in W3C Format - Status/Updates
  • Test Vectors Repo: https://github.com/TimoGlastra/anoncreds-w3c-test-vectors
  • Attachment Format to use for Present Proof will be DIF Presentation Exchange - Aries RFC 0510
  • ACA-Py work design document in repo
  • AnonCreds RS PRs
• Recent updates to AnonCreds RS – 0.2.0 release
• AnonCreds v1.0 1.0.0
• AnonCreds V2 ZKP Capabilities
  • How does Verifiable Encryption work?
    • Issuer setup – anything? Encoding types?
    • Issue process
    • Holder/Verifier presentation request / presentation
    • Decryption process
  • Equality proofs – claims across two source verifiable credentials
    • Presentation schema – two schema, two IDs, reference in one to the other ID?
  • Domain proofs – consistent identifiers for a verifier – different across different verifiers
    • Issuer setup?
    • Issue process?
    • Verifier presentation request?
    • Holder presentation process
• Claim Schema format
  • Default encoding if no other information?  E.g. if just the name is given.
    • Dynamic encoding using AnonCreds v1 rules?  Notably: "If integer or integerString, then integer, else stringified and hashed"
  • link_secret automatically added as in AnonCreds v1?
  • Externalized set for list of set members
  • Date as ISO Date and encoded as Integer Date
  • DateTime as ISO Date and encoded as Unix Time
  • Research – what can be derived from JSON-LD information?
• Open Discussion

To Dos:

Action items

• Links to be referenced in the spec and used where needed:
  
  • From Will Abramson : https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.186.5994&rep=rep1&type=pdf
  • From Will Abramson : https://github.com/hyperledger/indy-hipe/blob/c761c583b1e01c1e9d3ceda2b03b35336fdc8cc1/text/anoncreds-protocol/README.md