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Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01

Joe Touch <touch@ISI.EDU> Mon, 28 July 2008 17:52 UTC

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Date: Mon, 28 Jul 2008 10:52:09 -0700
From: Joe Touch <touch@ISI.EDU>
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To: Eric Rescorla <ekr@networkresonance.com>
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Cc: Adam Langley <agl@imperialviolet.org>, tcpm@ietf.org
Subject: Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
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Eric Rescorla wrote:
...
|> having a per-message counter is probably too much additional work.
|> Having a "pseudo" extended sequence number is very little work
|> (really, I've already implemented it) and that mean that we don't have
|> to rekey faster than the 32-bit sequence rollover. However, the
|> rekeying isn't all that painful anyway.
|
| It depends what you mean by rekeying. If it involves a new protocol
| exchange it is incredibly painful. If you mean just running the kdf
| again, I agree that's fine.

Both ends' key mgt systems can run the kdf again and this should work
fine. No need for on-the-wire exchanges, but no need to bury this into
TCP-AO IMO either.

Joe
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