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Re: [Rats] Requesting a Nonce from a Verifier

Watson Ladd <watsonbladd@gmail.com> Wed, 28 February 2024 02:12 UTC

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From: Watson Ladd <watsonbladd@gmail.com>
Date: Tue, 27 Feb 2024 18:12:24 -0800
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To: hannes.tschofenig=40gmx.net@dmarc.ietf.org
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Subject: Re: [Rats] Requesting a Nonce from a Verifier
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On Tue, Feb 27, 2024 at 6:19 AM
<hannes.tschofenig=40gmx.net@dmarc.ietf.org> wrote:
>
> Hi all,
>
>
>
> Hendrik and I have been working on an update of the CMP/EST extensions, which allow an Attester to request a nonce via the Relying Party (in the background check model). This “nonce draft”, see draft-tschofenig-lamps-nonce-cmp-est, aims to provide freshness for the CSR attestation draft (see draft-ietf-lamps-csr-attestation).

A nonce is not what is needed. The challenge for freshness needs to be
unpredictable: it needs to be a sufficiently long random value. The
terminology used here is unfortunate, and at odds with the accepted
definition in the cryptographic literature.

Sincerely,
Watson Ladd

-- 
Astra mortemque praestare gradatim

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