Re: [OAUTH-WG] Nonce-based Replay Protection for DPoP

Benjamin Kaduk <kaduk@mit.edu> Tue, 16 March 2021 23:21 UTC

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Date: Tue, 16 Mar 2021 16:21:47 -0700
From: Benjamin Kaduk <kaduk@mit.edu>
To: Rifaat Shekh-Yusef <rifaat.s.ietf@gmail.com>
Cc: Brian Campbell <bcampbell@pingidentity.com>, oauth <oauth@ietf.org>
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Subject: Re: [OAUTH-WG] Nonce-based Replay Protection for DPoP
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On Tue, Mar 16, 2021 at 05:45:46PM -0400, Rifaat Shekh-Yusef wrote:
> Brian,
> 
> For a nonce-based replay protection you. might want to look at the ACME
> protocol here:
> https://tools.ietf.org/html/rfc8555#section-6.5

Yes, that one is really solid for the sort of thing it does, and I find
myself recommending it over and over again.
Of course, that workflow is not universally applicable, so sometimes it's
not the right thing to do (and I don't remember enough about DPoP to say if
it works there).

-Ben