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Re: [COSE] COSE Support for AES-CTR and AES-CBC

Russ Housley <housley@vigilsec.com> Thu, 27 October 2022 15:59 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Thu, 27 Oct 2022 11:59:28 -0400
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Subject: Re: [COSE] COSE Support for AES-CTR and AES-CBC
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Please see the last slide in this presentation from IETF 114:
https://datatracker.ietf.org/meeting/114/materials/slides-114-cose-cose-hpke-00

The discussion is also in the minutes,

Note that the IANA registration proposed in draft-ietf-cose-aes-ctr-and-cbc for these algorithms are being registered as "Deprecated" to avoid accidental use without a companion integrity protection mechanism.

Russ

> On Oct 27, 2022, at 11:43 AM, Zundel, Brent <brent.zundel=40avast.com@dmarc.ietf.org> wrote:
> 
> Having only recently become aware of this thread, I apologize for the lateness of this, but feel compelled to share my concerns as well.
> 
> While it is true that AES-CTR and AES-CBC have been included in RFCs for years, I would like to direct the attention of folks to the IANA registry for JOSE, where AES-CBC and AES-CTR are marked as 'Prohibited' for JOSE Implementations.
> 
> I don't understand going to the effort of defining AES-CTR and AES-CBC for CBOR when these modes are already recognized elsewhere as bad enough to prohibit.
> 
> -- 
> Brent Zundel
> Principle Crypto Engineer - Avast

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