Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
Eric Rescorla <ekr@networkresonance.com> Tue, 29 July 2008 13:52 UTC
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Date: Tue, 29 Jul 2008 06:52:59 -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, "Anantha Ramaiah (ananth)" <ananth@cisco.com>
Subject: Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
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At Tue, 29 Jul 2008 06:40:48 -0700, Joe Touch wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > > Anantha Ramaiah (ananth) wrote: > | Folks, > | The extended feeling which I get after watching some of the > | conversation is that we seem to be in a cherry picking mode of what to > | include/exclude in the digest (MAC) computation. (psuedo header, TCP > | options etc.,) > | > | So, if we are going down that route, then I would argue it may be > | worthwhile to debate "how much" to include in general, i.e, is it > | worthwhile to include selective portions OR part of the data portion of > | the TCP data in the MAC computation instead of he entire data.? > > Absolutely; that can be implemented inside the MAC algorithm, opaquely > to TCP-AO, though. I.e., I can create a MAC that hashes only the odd > blocks, only the first half of the blocks, etc. > > Whether or not there are options to that MAC or not that need to be > coordinated end-to-end is up to the key management system; e.g., > parameters like "just the firs 10 bytes" can be encoded - again opaquely > to TCP-AO - in the key used on a connection. Well, it's true that one *could* do this, but I think it's a really bad idea. MACs should provide a uniform interface and set of semantics. If you want to have partial coverage, this should be handled at the TCP-AO level. I appreciate that you're trying to isolate the crypto from the TCP-AO service, but I don't think you can isolate it to this extent. -Ekr _______________________________________________ tcpm mailing list tcpm@ietf.org https://www.ietf.org/mailman/listinfo/tcpm
- [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01 Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Adam Langley
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Adam Langley
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Adam Langley
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Anantha Ramaiah (ananth)
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Anantha Ramaiah (ananth)
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Anantha Ramaiah (ananth)
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Caitlin Bestler
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Joe Touch
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Lars Eggert
- Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt… Eric Rescorla
- [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Adam Langley
- Re: [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Adam Langley
- Re: [tcpm] tcp-auth-opt issue: replay protection Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Adam Langley
- Re: [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Lars Eggert
- Re: [tcpm] tcp-auth-opt issue: replay protection Eric Rescorla
- Re: [tcpm] tcp-auth-opt issue: replay protection Lars Eggert
- Re: [tcpm] tcp-auth-opt issue: replay protection Anantha Ramaiah (ananth)
- Re: [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Eddy, Wesley M. (GRC-RCN0)[VZ]
- Re: [tcpm] tcp-auth-opt issue: replay protection Adam Langley
- Re: [tcpm] tcp-auth-opt issue: replay protection Caitlin Bestler
- Re: [tcpm] tcp-auth-opt issue: replay protection Joe Touch
- Re: [tcpm] tcp-auth-opt issue: replay protection Ron Bonica