RE: New Paper on VC Flavors

Very helpful and understandable paper, Kaliya. Thank you!

Best Regards,

Anil

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

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From: Kaliya IDwoman <kaliya-id@identitywoman.net>
Sent: Thursday, February 11, 2021 1:39 PM
To: Credentials CG <public-credentials@w3.org>
Subject: New Paper on VC Flavors

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Hi CCG,

 I wanted to share a paper that I wrote which was just published by LFPH/CCI  - https://www.lfph.io/2021/02/11/cci-verifiable-credentials-flavors-and-interoperability-paper/<https://urldefense.us/v2/url?u=https-3A__www.lfph.io_2021_02_11_cci-2Dverifiable-2Dcredentials-2Dflavors-2Dand-2Dinteroperability-2Dpaper_&d=DwMFaQ&c=2plI3hXH8ww3j2g8pV19QHIf4SmK_I-Eol_p9P0CttE&r=FUgYmx6LTIaPqn7QR6TBfzml-fqCTpab-djgqlCFtgU&m=Vay_IWys0pWf98Glm-7muB89AGbID9NfQMBDcsrPqQM&s=-zNAAgiqLvZsbasvKGLxTIC0ia9LqBKGEcln-J2qv0U&e=>

  The PDF can be found here. https://www.lfph.io/wp-content/uploads/2021/02/Verifiable-Credentials-Flavors-Explained.pdf<https://urldefense.us/v2/url?u=https-3A__www.lfph.io_wp-2Dcontent_uploads_2021_02_Verifiable-2DCredentials-2DFlavors-2DExplained.pdf&d=DwMFaQ&c=2plI3hXH8ww3j2g8pV19QHIf4SmK_I-Eol_p9P0CttE&r=FUgYmx6LTIaPqn7QR6TBfzml-fqCTpab-djgqlCFtgU&m=Vay_IWys0pWf98Glm-7muB89AGbID9NfQMBDcsrPqQM&s=Yc32QJWeIS87LZrJhilc8xCWrRc1xhu4o60LQJNc208&e=>


The first part of the paper elaborated on the following three data formats of VCs by walking through a credential lifecycle:

  *   JSON-LD family with LD Signatures or with BBS+ Signatures that enable Zero Knowledge Proofs (ZKP or ZKPs)
  *   JSON with JSON Web Signatures, precisely in the form of a JSON Web Token (JWT)
  *   ZKP with Camenisch-Lysyanskaya Signatures (ZKP-CL)

The second part discussed at length the differences between JSON and JSON-LD and the differences between the two different ways to express ZKPs, namely ZKP-CL and the newest flavor JSON-LD ZKP with BBS+, which is being well received.

I hope it can help reduce the confusion in the market and support convergence.

- Kaliya