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Is DES exportability context-dependent?
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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