Re: [tcpinc] Eric Rescorla's Discuss on draft-ietf-tcpinc-tcpcrypt-09: (with DISCUSS and COMMENT)

Eric Rescorla <ekr@rtfm.com> Mon, 05 November 2018 11:22 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Mon, 5 Nov 2018 03:21:46 -0800
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To: mazieres-nj788xtv7k4q4yq2nedg4eupms@temporary-address.scs.stanford.edu
Cc: tcpinc <tcpinc@ietf.org>, Daniel B Giffin <dbg@scs.stanford.edu>, Kyle Rose <krose@krose.org>, tcpinc-chairs@ietf.org, "Black, David" <David.Black@dell.com>, IESG <iesg@ietf.org>, draft-ietf-tcpinc-tcpcrypt@ietf.org
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Subject: Re: [tcpinc] Eric Rescorla's Discuss on draft-ietf-tcpinc-tcpcrypt-09: (with DISCUSS and COMMENT)
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On Sun, Nov 4, 2018 at 5:29 AM David Mazieres <
dm-list-tcpcrypt@scs.stanford.edu>; wrote:

> I've posted a new draft in the usual place:
>
>         https://datatracker.ietf.org/doc/draft-ietf-tcpinc-tcpcrypt/
>
> Please let us know if the diffs satisfy your concerns:
>
>
> https://www.ietf.org/rfcdiff?url1=draft-ietf-tcpinc-tcpcrypt-13&url2=draft-ietf-tcpinc-tcpcrypt-14&difftype=--html


I am not an EC expert, but my impression based on the discussion in TLS was
that checking for the zero value for X25519 was not sufficient defense
against malicious peers if you didn't use the 7748 computations, hence the
language in 8446. Do you believe otherwise?

-Ekr


>
> Thanks,
> David
>