Re: [TLS] Safe ECC usage

Michael StJohns <msj@nthpermutation.com> Fri, 18 October 2013 16:35 UTC

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Date: Fri, 18 Oct 2013 12:35:49 -0400
From: Michael StJohns <msj@nthpermutation.com>
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Subject: Re: [TLS] Safe ECC usage
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I've been watching the curve conspiracy discussion stuff for a bit. I 
don't actually know what the reality is.  So I decided to try and find 
the earliest mention of one of the seeds.  I half expected I was going 
to find the seed string had been pulled from the random number tables in 
the CRC handbook.

I googled for "C49D3608 86E70493 6A6678E1 139D26B7 819F7E90" - the seed 
for P256 and found:

ftp://ftp.iks-jena.de/mitarb/lutz/standards/ansi/X9/x962-11-17-97.pdf

This document has the seed for P256 and P192 (which also matches) but 
not P384 or P521. Only sample curves up to 256 bits were provided.

The existence of this document, created in 1997 would tend to suggest 
that at least a few curves were created in X9 and not by NIST given the 
document precedes the FIPS 186-2 publication by a couple of years.  Of 
course, X9 could have just gotten the curves from NIST as a submission - 
but why weren't P384 and P521 provided at that point?

  I don't have access to the X9 archives - maybe someone out there has a 
set of X9 correspondence around 1997 or so that we could take a look 
at?  I would expect the curves to be some form of specific contribution.

Mike