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[COSE] Comments on draft-schaad-cose-more-algs-00

John Mattsson <john.mattsson@ericsson.com> Tue, 26 November 2019 15:24 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: "cose@ietf.org" <cose@ietf.org>
Thread-Topic: Comments on draft-schaad-cose-more-algs-00
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Date: Tue, 26 Nov 2019 15:24:22 +0000
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Subject: [COSE] Comments on draft-schaad-cose-more-algs-00
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Hi,

Is A192KW-Pad needed? I don’t think I have ever seen an application actually using AES-192. Application wanting more than 128-bit security typically use AES-256, even together with algorithms like P-384 and SHA-384.

I know that RFC 8152 defines A192KW and in general I don’t see a problem with defining A192KW-Pad, but it should maybe not be given one of the limited small values for its label (TBD2) unless someone express that they want to use AES-192.

Cheers,
John

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