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Re: [IPsec] Beginning the PAKE selection process

Nicolas Williams <Nicolas.Williams@oracle.com> Wed, 26 May 2010 00:41 UTC

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Date: Tue, 25 May 2010 18:21:00 -0500
From: Nicolas Williams <Nicolas.Williams@oracle.com>
To: Paul Hoffman <paul.hoffman@vpnc.org>
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Subject: Re: [IPsec] Beginning the PAKE selection process
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On Tue, May 25, 2010 at 04:24:38PM -0500, Nicolas Williams wrote:
> A thought about PAKEs and ZKPPs...

I should also mention that the benefits of the SCRAM-with-cb
approach: a) simplicity (doesn't get much simpler!), b) this is
completely unencumbered to the best of my knowledge[*].

The one downside is, as I described, the need to separately authenticate
the server to avoid sending material that is suitable for off-line
dictionary attacks to active attackers.  In practice this is easy to
deal with.

[*] SCRAM is based on DIGEST-MD5, which, to the best of my knowledge is
    unencumbered and has had a fruitful deployment store.

    Channel binding goes back to the early 90s (92, I believe) and, to
    the best of my knowledge, is also unencumbered.

Nico
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