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Re: [TLS] Working Group Last Call for draft-ietf-tls-pwd

Robert Ransom <rransom.8774@gmail.com> Mon, 02 December 2013 19:43 UTC

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Date: Mon, 02 Dec 2013 11:43:38 -0800
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From: Robert Ransom <rransom.8774@gmail.com>
To: Watson Ladd <watsonbladd@gmail.com>
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Subject: Re: [TLS] Working Group Last Call for draft-ietf-tls-pwd
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On 12/2/13, Robert Ransom <rransom.8774@gmail.com> wrote:

> The Elligator paper (published in August) cites a PAKE paper from 2001
> as a possible use for injective maps.  The J-PAKE paper (published in
> 2008) states that there were no good unpatented PAKE protocols
> available at the time J-PAKE was published, and even the patented
> protocols were not secure.  Is this protocol related to the 2001
> protocol, is that protocol patented, and if so, does that patent cover
> this protocol?

The J-PAKE paper includes a description of ‘SPEKE’ (according to the
citations, published in 1996 and patented in U.S. patent 6,226,383).
It is essentially DH with a secret base over a modular-multiplication
group.  The J-PAKE paper also mentions a theoretical attack that could
allow an attacker to test multiple passwords in one protocol
execution, although that doesn't seem plausible.

I guess someone will have to read the patent to find out whether it
claims PWD as well.


Robert Ransom

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