Re: Anonymous Credentials from ECDSA

On Wed, Apr 23, 2025 at 9:03 PM Harrison <harrison@spokeo.com> wrote:
> Main Agenda: Anonymous Credentials from ECDSA

Hi Abhi and Matteo,

Thank you for the presentation on anonymous credentials from ECDSA; it
is certainly an exciting area of work and your presentation and
continued effort in the space is deeply appreciated. :)

I wanted to follow up on a couple of questions you asked during the
call today. I expect the CCG Data Integrity work stream, which meets
every Friday at 10am ET, will be more interested in engaging with you
and Matteo directly to help create some working examples of what we
believe is achievable. We've already been working with some other
SNARK folks to explore what efficient SNARKs (not hobbled by ECDSA,
BASE64, and JSON parsing might look like using the VC Data Integrity
work). Both of you have an open invitation to join those calls, we can
give you the floor and make it into a working session to make progress
on applying your techniques to the W3C VC work.

Specifically, these are at least some of the items I think we could
cover (I'll follow up on details in another email):

1. Flattened data structures optimized for SNARKs.
2. Compact binary representations optimized for SNARKs.
3. Revocation list strategies (the one you provided is intriguing, but
raises some identifiability/scalability concerns).
4. Pseudonym strategies (again, your approach was intriguing, but we
were talking past each other on the "everlasting unlinkability" vs.
"statistical unlinkability" vs. "computational unlinkability" vs.
"post-quantum unlinkability" misalignment)

I know that we would be interested in using the cryptographic
primitives you mentioned on the call today for more efficient SNARKs
for VCs as well as pseudonyms and revocation list mechanisms. We can
build some proof of concepts if we can get more clarity on 1 and 2
above.

Can you make a 10am ET Data Integrity work stream call during any of
the weeks in May/June? We can start the discussion on the mailing list
and then move to a higher bandwidth meeting if it makes sense to do
so?

-- manu

-- 
Manu Sporny - https://www.linkedin.com/in/manusporny/
Founder/CEO - Digital Bazaar, Inc.
https://www.digitalbazaar.com/

Received on Tuesday, 29 April 2025 21:11:30 UTC