Re: OMAC help
From: Jack Lloyd (lloyd_at_jhu.edu)
Date: 06/14/03
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Date: Sat, 14 Jun 2003 12:56:57 -0400
On Sat, 14 Jun 2003 11:50:27 -0400, unknown wrote:
> I'm having some problems in understanding how to deal with
> polynomial multiplication, so I would be very grateful if you could help
> me.
I'm the wrong person to ask about that, unfortunately. GF math has never
agreed with me.
> In the EAX paper it is defined that B=2L and P=2(2L). I can
> understan this, however, in the EMD paper, it is defined that some value
> (hereinafter designated by Xi) is defined by Xi=iL for i=1..n (the
> polynomial X is the same). How can this be calculated for i other than 2
> and 4?
You should be aware that EMD is broken - the papers at
http://eprint.iacr.org/2002/148/ have a note added (as of Feb 2003),
that there is a bug in the proofs, and that EMD is not secure.
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