On Thu, 12 Oct 1995, Jiri Baum wrote: > > If you are reading a signed message, you simply strip off the Not a good choice of words - remember, you should never expose your private, er, key... Simon --- (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))))