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Re: [Rats] Epochs

Laurence Lundblade <lgl@island-resort.com> Thu, 29 September 2022 16:47 UTC

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From: Laurence Lundblade <lgl@island-resort.com>
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Date: Thu, 29 Sep 2022 09:47:22 -0700
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Cc: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "rats@ietf.org" <rats@ietf.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Rats] Epochs
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> On Sep 29, 2022, at 5:21 AM, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> Hannes Tschofenig <Hannes.Tschofenig@arm.com <mailto:Hannes.Tschofenig@arm.com>> wrote:
>>  1.  Would you expect that all solutions support all three freshness
>> mechanisms, namely epoch ids, timestamps and nonces?
> 
> No, certainly not.
> A specific deployment (like an EAT profile) would support one.

Yes

> 
> Maybe a mechanism (like EAT...) could be adapted to all three, but that
> wouldn't be required.  I am unclear if TEEP needs to support multiple
> mechanisms. (i.e. I'm ignorant)

It’s a good idea to define a claim for epochs in EAT, but we don’t want to do it in the EAT document only because EAT is big enough as is and we want to get it done. Seems like a separate little draft would be good.

LL

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