2022-04-19 Aries Cloud Agent - Python Users Group Community Meeting

Owned by Stephen Curran
Last updated: Apr 20, 2022

Summary:

Planned Topics:

  • Proposal/Discussion: Adding support for DIDComm V2/WACI to ACA-Py – led by Hakan Yildiz
    • Homework – Please review this proposal and think about the issues raised
  • Getting to release 0.7.4

Recordings from the call: 

  • Full Meeting: dummyfile.txt
  • Extracted segments:
  • Chat

    • 08:08:48 From Peter Altmann - DIGG : I hope I can introduce myself here. I am Peter Altmann from the Swedish Agency for Digital Government. I work in the EU commission on the technical specifications for the proposed EU Digital Identity Wallet. I also work with some public sector actors in Sweden where I have used ACA-Py to develop some proof of concepts. Nice to be here!

    • 08:17:25 From Victor Martinez : DIDCOMMv2 provides a negotiation compatibility https://identity.foundation/didcomm-messaging/spec/#negotiating-compatibility

    • 08:19:17 From Artur Philipp : But does this offer the Option to negotiate the envolope (V1 vs V2)? A Client which only supports V1, is then probably not able to negotiate, Right?

    • 08:19:55 From Andrew Whitehead : A client that only supports V1 probably can't decode a V2 envelope at all

    • 08:22:09 From Victor Martinez : Maybe something to take into account, SICPA has started a project to introduce DIDCOMM v2 in Aries JS.

    • 08:22:40 From Victor Martinez : Some comments regarding SICPA implementation :

    • 08:22:52 From Victor Martinez : If underlying primitives computing performance is a concern:

      Dependency tree:
      Didcomm -> Authlib -> cryptography

      Cryptography relies on foreign function interfaces (FFI):

      for OpenSSL: https://github.com/pyca/cryptography/tree/main/src/_cffi_src/openssl
      For rust code (x509 implementation): https://github.com/pyca/cryptography/tree/main/src/rust/src
      Conclusion: low-level, performance-critical code is implemented in C or Rust.

    • 08:27:11 From Andrew Whitehead : Askar also contains Rust implementations of the primitives

    • 08:29:43 From Peter Strobel : Oh that's interesting, I wasn't aware a v2 connection could be established without an Out Of Band invitation!

    • 08:38:54 From Daniel Bluhm : I'll see if I can follow up with Sam on why the V3 was required and report back on the acapy channel on Discord

    • 08:44:37 From Stephen Curran : Peter Strobel — that can be done in DIDComm V1 as well. “Implicit invitations” are when a party has a DIDComm service entry in their public DID. Another party can use that without an OOB.

    • 08:46:03 From Andrew Whitehead : Not sure if it does make sense to automatically upgrade a V1 connection to V2 without rotating the DID, because the cryptography used is different

    • 08:47:26 From Andrew Whitehead : Downgrading V2 to V1 is a worse proposition


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Welcome and Introductions

Attendees

  • Stephen Curran (Cloud Compass Computing Inc.) <swcurran@cloudcompass.ca>

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