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Important Digital Cash Question...
Ok. So we've got Alice and Bob trading their cash back and forth, with
Mallet trying to steal their cyber-dosh, and Eve listening to their
conversations- this leads me to the big question:
What's the right name to use for the Banker? I've been using "Nick",
after Nick Leeson; any other suggestions?
(defun modexpt (x y n) "computes (x^y) mod n"
(cond ((= y 0) 1) ((= y 1) (mod x n))
((evenp y) (mod (expt (modexpt x (/ y 2) n) 2) n))
(t (mod (* x (modexpt x (1- y) n)) n))))