At 3:19 PM -0400 7/1/09, Scott C Moonen wrote:
> RFC 4753 documents that the shared secret obtained from an ECP
> Diffie-Hellman operation is the concatenation of the x and y
> coordinates of the derived point.
> Is that correct?

It is not.  There is an errata for RFC 4753.  The shared secret
is the x coordinate of the derived point.

See: http://www.rfc-editor.org/errata_search.php?eid=9

Regards, Sean

Sean Kevin O'Keeffe
STRATUS Solutions, Inc.

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