Re: [tcpm] TCP-AO review comments.

Joe Touch <touch@ISI.EDU> Thu, 07 August 2008 18:27 UTC

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Date: Thu, 07 Aug 2008 11:27:02 -0700
From: Joe Touch <touch@ISI.EDU>
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To: Chandrashekhar Appanna <achandra@cisco.com>
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Subject: Re: [tcpm] TCP-AO review comments.
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Chandrashekhar Appanna wrote:
Just to clear up a potential point of confusion

...
|> I think that "obsoletes" is correct.
|
|   Not sure if this will obselete that.. this is a new option with
different
|   goals

AFAICT, this option has the same fundamental goal - transport layer
protection of the transport protocol. TCP-AO has additional requirements
that exceed TCP MD5, primarily (and arguably solely) to address
inadequacies in TCP MD5.

|   and we are not even sure if at this point how much consensus there
|   is about moving AO forward.. there is much discussion on the keying
aspects,
|   the design team seems to be just one person speaking up mostly; and
|   given the comments from other design team members at the mike at the
ietf
|   I would not be in favour of making AO obselete the other method..
like you
|   say the status of the document has no power and therefore it is better
|   to not think it has some if it does not line up ;).. forcing a document
|   through without the implied working code and rough consensus may end up
|   doing more harm to the doc itself..

TCP MD5 uses a faulty hash and does not protect against replay attacks.
IMO it is sufficiently faulty that it ought to be deprecated regardless
of the state of a replacement.

Joe
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