Re: [tcpm] Review of draft-ietf-tcpm-tcp-auth-opt-01
Eric Rescorla <ekr@networkresonance.com> Tue, 29 July 2008 15:17 UTC
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Date: Tue, 29 Jul 2008 08:17:49 -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 07:10:19 -0700, Joe Touch wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, Eric, > > Eric Rescorla wrote: > | At Tue, 29 Jul 2008 06:40:48 -0700, > | Joe Touch wrote: > |> -----BEGIN PGP SIGNED MESSAGE----- > |> Hash: SHA1 > ... > |> | 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. > ... > | 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. > > First, I'm not sure this overall function is useful; since apps can't > align data to the TCP segments, IMO the data is "all or none". I don't > see a reason to omit the data entirely from a MAC (excepting performance > for statistical benefit). > > Overall, this doesn't seem to fit the spirit of "TCP-AO should be simple". > > | 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. > > It would be useful to explain the reason you see a need for coupling > here (provided this is even needed, as noted above). (1) I don't think it's needed. (2) The semantics of partial protection are only meaningful at the TCP layer. The MAC just operates on chunks of bits. -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