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

Eric Rescorla <ekr@networkresonance.com> Mon, 28 July 2008 18:02 UTC

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Date: Mon, 28 Jul 2008 11:02:53 -0700
From: Eric Rescorla <ekr@networkresonance.com>
To: Joe Touch <touch@ISI.EDU>
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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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At Mon, 28 Jul 2008 10:52:09 -0700,
Joe Touch wrote:
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 
> 
> 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.

Well, it needs to be used with TCP-AO regardless of which 
integrity algorithm is used. Why wouldn't we want to 
"bury" that in TCP-AO?

-Ekr

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