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Re: [perpass] NULL Cipher RFC 2410 to HISTORIC ???

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 09 December 2013 15:47 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Phillip Hallam-Baker <hallam@gmail.com>
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Date: Mon, 09 Dec 2013 10:46:53 -0500
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Cc: perpass <perpass@ietf.org>, Yoav Nir <ynir@checkpoint.com>, Merike Kaeo <merike@doubleshotsecurity.com>
Subject: Re: [perpass] NULL Cipher RFC 2410 to HISTORIC ???
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Phillip Hallam-Baker <hallam@gmail.com> wrote:
    >     Phil,

    >     The issue is not that ESP needs a NULL cipher. It's that AH
    > wouldn't traverse NAT, and so they needed ESP to do the work that AH
    > was designed to do.


    > I understand that, though the fact that ESP with authentication would
    > work through NAT but not AH seems remarkably odd to me. It suggests
    > that the design is wrong.

    > That flags a design error in the protocol AFIAK. 

No, it's because NAT is an attack by a middle box on end to end flow, and
back in 1994, we didn't think anyone would be so stupid as to do that kind of
thing.



--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works

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