2024-02-05 AnonCreds Working Group Meeting

Summary

• AnonCreds in W3C Format - Status Update / Issues
• AnonCreds v2 Objects – Review, suggestions – especially ALLOSAUR revocation, verifiable encryption, and (perhaps) other advanced ZKP capabilities
• 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:
• Any updates to the Agenda?

Agenda

• AnonCreds in W3C Format - Status/Updates
  • Proposal to use new format for issuing: https://github.com/hyperledger/aries-rfcs/pull/809 (based on https://hackmd.io/JEIOxf_ETnaX33kTIu7YJw?view)
  • 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 HackMD
• AnonCreds V2 Objects - Presentation from last meeting, evolved
  • How does ALLOSAUR Revocation work? High level – not at the crypto. More about what data gets generated (inputs, size) and shared between participants.
    • Issuer and Revocation Manager relationship
    • Issuer setup
    • Issuer credential issuance
      • Data to holder
      • Data to revocation manager
    • Issuer revocation
      • Data to revocation manager
    • Holder and revocation manager for presentation – request data, response data
      • What about when doing another presentation 2 weeks later with a different verifier?
    • Holder to verifier non-revocation proof data
    • Verifier and revocation manager – request data, response data
  • How does Verifiable Encryption work?
    • Issuer setup
    • Issue process
    • Holder/Verifier presentation request / presentation
    • Decryption process
• Open Discussion

Future Calls

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

W3C AnonCreds + AFJ Demo

• Aries Framework JavaScript repo: https://github.com/DSRCorporation/aries-framework-javascript/tree/w3c-demo-poc
• Anoncreds-RS library, Anoncreds-NodeJs, and Anoncreds-Shared are built from the branch: https://github.com/DSRCorporation/anoncreds-rs/tree/anoncreds-wc3-wrappers
  • Use main implementation (not included, dropping of mapping  and encoding  changes)
• Update AFJ @hyperledger/anoncreds-nodejs  and `@hyperledger/anoncreds-shared` dependencies to use locally built packages