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[OAUTH-WG] Re: We cannot trust Issuers

Leif Johansson <leifj@mnt.se> Tue, 23 July 2024 17:13 UTC

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From: Leif Johansson <leifj@mnt.se>
To: Richard Barnes <rlb@ipv.sx>, Watson Ladd <watsonbladd@gmail.com>
Date: Tue, 23 Jul 2024 19:15:30 +0200
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Subject: [OAUTH-WG] Re: We cannot trust Issuers
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On Mon, 2024-07-22 at 19:43 -0400, Richard Barnes wrote:
> I would observe that any solution based on garden-variety digital
> signature (not something zero-knowledge like BBS / JWP) will have
> problems with issuer/verifier collusion.  One-time tokens and batch
> issuance don't help.  There is no such thing as SD-JWT with
> issuer/verifier collusion resistance.  At best you could have SD-JWP.
> 
> I don't think this needs to be a blocker on SD-JWT.  There are use
> cases that don't require issuer/verifier collusion resistance.  We
> should be clear on the security considerations and warn people away
> who care about issuer/verifier collusion resistance, and accelerate
> work on SD-JWP if that's an important property to folks.
> 


+1 on this

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