RE: Work item suggestion: BBS Cryptosuite for Data Integrity

Selective disclosure capabilities that natively support JSON-LD credential formats for W3C Verifiable Credentials are a must have functionality for our ongoing workstreams:

  *   From a privacy and non-linkability aspects for our immigration credentials issuance by the U.S. Citizenship and Immigration Services and;
  *   From a selective business information disclosure for our U.S. Customs and Border Protection cross-border supply chain / trade work

The fact that the BBS work, incubated at the W3C CCG, is undergoing cryptographic review via the IETF CFRG (https://datatracker.ietf.org/doc/draft-irtf-cfrg-bbs-signatures/ ), which is respected globally for its expertise, and which provides visibility to our technical authority on cryptography, NIST, is something that gives us confidence in the work and its path to formal standardization.

As such, we support this work for inclusion in the VC Data Integrity cryptosuites given our existing and stated support for VC Data Integrity in our technical implementation profile.

Support added to the letter.

Best Regards,

Anil

Anil John
Technical Director, Silicon Valley Innovation Program
Science and Technology Directorate
US Department of Homeland Security
Washington, DC, USA

Email Response Time - 24 Hours

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From: Tobias Looker <tobias.looker@mattr.global>
Sent: Tuesday, March 14, 2023 6:41 PM
To: public-vc-wg@w3.org
Subject: Work item suggestion: BBS Cryptosuite for Data Integrity

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Hi all,

Following the VCWG adoption of the VC Data Integrity, this email is to call for the adoption of the BBS crypto suite for usage in this scheme [1].

Since its inception as a CCG work item in 2020, significant work has been put in to mature the underlying cryptographic scheme of BBS which is shown through the adoption of it as a work item of the CFRG and recent publication of our second draft version that contains end to end test vectors which have been verified by multiple independent implementations [2].

Following this we have been working on a revision to the current BbsSignature*2020 suite (formerly know as a Linked Data Proof suite) that will form the basis of this work item that makes use of the latest version of the BBS crypto scheme[2].

BBS represents an important work item for Data Integrity as it enables properties such as selective disclosure and unlinkability.

Given the impending new work item freeze / feature freeze in the VCWG at the end of March 2023, roughly two weeks from now, we need to make the call for adoption of this work item soon.

If you are an organization (or an implementer) that would like to see support for BBS in the VC Data Integrity cryptosuites, then please add your name, title, and organization to the end of this Google Doc:

https://docs.google.com/document/d/1RCQWjqeHL-o6gddXC3kzPy0chEC0rdWQFp1J_xk2HsI/edit<https://urldefense.us/v3/__https:/docs.google.com/document/d/1RCQWjqeHL-o6gddXC3kzPy0chEC0rdWQFp1J_xk2HsI/edit__;!!BClRuOV5cvtbuNI!T4f5ESrz0TeaHYUAY-eTS85UtwiIewSnU2AskDPDZlkzUFi64OR4zVk5auuRb2uD4Ctc$>

As has been the case for other recent adoption calls we'll be collecting signatures this week, and then running a call for adoption in the VCWG once we have enough signatures. The more signatures of support the better, you don't have to be a W3C Member to sign the letter.

[1] https://w3c-ccg.github.io/ldp-bbs2020/<https://urldefense.us/v3/__https:/w3c-ccg.github.io/ldp-bbs2020/__;!!BClRuOV5cvtbuNI!T4f5ESrz0TeaHYUAY-eTS85UtwiIewSnU2AskDPDZlkzUFi64OR4zVk5auuRb9nu8qNh$>
[2]https://www.ietf.org/archive/id/draft-irtf-cfrg-bbs-signatures-02.html<https://urldefense.us/v3/__https:/www.ietf.org/archive/id/draft-irtf-cfrg-bbs-signatures-02.html__;!!BClRuOV5cvtbuNI!T4f5ESrz0TeaHYUAY-eTS85UtwiIewSnU2AskDPDZlkzUFi64OR4zVk5auuRb8pBN2Uv$>

Thanks,
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Tobias Looker
MATTR
+64 273 780 461
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