Work item suggestion: BBS Cryptosuite for Data Integrity

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

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/
[2]https://www.ietf.org/archive/id/draft-irtf-cfrg-bbs-signatures-02.html

Thanks,
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Tobias Looker
MATTR
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