Re: [TLS] draft on new TLS key exchange

Jean-Marc Desperrier <jmdesp@free.fr> Fri, 07 October 2011 14:25 UTC

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Date: Fri, 07 Oct 2011 16:28:43 +0200
From: Jean-Marc Desperrier <jmdesp@free.fr>
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Subject: Re: [TLS] draft on new TLS key exchange
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Peter Gutmann wrote:
> Speaking of SRP, I'm told the EKE patent expired a few days ago.

True for US 5,241,599 :
http://www.google.com/patents?id=LxgbAAAAEBAJ
Filing date: Oct 2, 1991, Issue date: Aug 31, 1993
(US patent law for patents filed before Aug 95 : Valid for 20 years 
after filing date, or 17 years after issue date, whichever is longer )

Not true for US 5,440,635 :
http://www.google.com/patents?id=ByMhAAAAEBAJ
Filing date: Aug 23, 1993, Issue date: Aug 8, 1995
=> Valid until Aug 23, 2013

Lucent used to claim both /could/ apply to SRP 
http://www.ietf.org/proceedings/53/slides/ips-9/tsld010.htm before 
reverting to a position of pure FUD on the subject 
http://www.ietf.org/proceedings/53/slides/ips-9/tsld011.htm