From: m5@vail.tivoli.com (Mike McNally)
Date: Tue, 31 May 94 11:08:51 PDT
To: cypherpunks@toad.com
Subject: Is DES exportability context-dependent?
Message-ID: <9405311808.AA10701@vail.tivoli.com>
MIME-Version: 1.0
Content-Type: text/plain



I don't have my "Applied Cryptography" handy, but this keyboard's here
in front of me always ready :-)

Lets say I rigged up a "signature" system that cranked the message
through a DES or 3DES engine in CBC mode, and used the last value as
the signature (or something like that; whatever makes the most sense).
In that context---as a signature algorithm---would DES be exportable?

It's been demonstrated that something developed as a signature
algorithm but later adapted to encryption purposes remains exportable,
right?  What about going the other direction?


--
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