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

Jim Schaad <ietf@augustcellars.com> Tue, 26 November 2019 20:12 UTC

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From: Jim Schaad <ietf@augustcellars.com>
To: 'John Mattsson' <john.mattsson=40ericsson.com@dmarc.ietf.org>, cose@ietf.org
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Subject: Re: [COSE] Comments on draft-schaad-cose-more-algs-00
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I don't care one way or the other on this.  I believe that the 192 key lengths for AES are being used in some of the US government profiles, but that would not be relevant here because I don't think those profiles would be used here.

Jim


-----Original Message-----
From: COSE <cose-bounces@ietf.org> On Behalf Of John Mattsson
Sent: Tuesday, November 26, 2019 7:24 AM
To: cose@ietf.org
Subject: [COSE] Comments on draft-schaad-cose-more-algs-00

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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