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Re: [Suit] suit-firmware-encryption-00

Laurence Lundblade <lgl@island-resort.com> Thu, 27 May 2021 20:02 UTC

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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Thu, 27 May 2021 13:01:58 -0700
Cc: Russ Housley <housley@vigilsec.com>, Michael Richardson <mcr+ietf@sandelman.ca>, suit@ietf.org
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Subject: Re: [Suit] suit-firmware-encryption-00
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> On May 27, 2021, at 12:57 PM, Carsten Bormann <cabo@tzi.org> wrote:
> 
> On 2021-05-27, at 21:40, Russ Housley <housley@vigilsec.com> wrote:
>> 
>> CEK = content-encryption key, which is defined in PKCS#7 and CMS.  I think the first uses are in RFC 2630 and RFC 2631.
>> 
>> KEK - key-encryption key, which is used in thoses same RFCs, but it was also used as early as RFC 1949.
> 
> FYI: RFC 4949, which should still be the goto resource here, has KEK, but not CEK (which is called a DEK there, if I get the analogy right — I certainly have heard CEK much more than DEK).

COSE RFC 8152 uses CEK and KEK.  I’ve heard them in other contexts and I find them clear and useful myself.

LL

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