Does anyone know of any ciphers where bits of keys modify the control path,
rather than just data operations? Yes, I know that that's a slippery concept,
since ultimately things like addition and multiplication can be implemented
with loops in the hardware or firmware. I also suspect that it's potentially
dangerous, since it might create very hard-to-spot classes of weak keys. The
closest I can think of is SIGABA, where some of the keying controlled the
stepping of the other rotors.
--Steve Bellovin, http://www.cs.columbia.edu/~smb
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