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Re: [tcpinc] Revised version of TCP-ENO

Daniel B Giffin <dbg@scs.stanford.edu> Thu, 13 August 2015 23:23 UTC

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Date: Thu, 13 Aug 2015 16:23:52 -0700
From: Daniel B Giffin <dbg@scs.stanford.edu>
To: Martin Thomson <martin.thomson@gmail.com>
Message-ID: <20150813232352.GA18349@scs.stanford.edu>
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Cc: tcpinc <tcpinc@ietf.org>
Subject: Re: [tcpinc] Revised version of TCP-ENO
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Martin Thomson wrote:
> On 13 August 2015 at 15:22, David Mazieres
> <dm-list-tcpcrypt@scs.stanford.edu> wrote:
> >
> > * Unless and until applications disclose information about the session
> >   ID, all but the first byte MUST be computationally indistinguishable
> >   from random bytes to a network eavesdropper.
> 
> 
> Don't call out the first byte.  The whole thing is what will matter
> here.  As long as two session IDs are indistinguishable from each
> other, I think that we're OK.

david is just exempting the negotiated "spec identifier"
that TCP-ENO prepends to the collision-resistant hash of
connection information.

that byte indicates what encryption protocol was negotiated,
and of course will be easily distinguishable from random.

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