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Re: Rabin decryption

At 22:09 5/15/94 -0500, [email protected] wrote:
>How do you do Rabin decryption?
>Anybody know the right way to do square roots mod a Blum integer? 

Page 545 of Knuth's "Seminumerical Algorithms" gives a method of finding
the square root modulo a prime. It is efficient but non-trivial to program.
Incidently its worst case running time is as big as the number (actually
bigger) but its expected time is something like (nog n)^2.

My most recent errata list for Applied Cryptography does not amend page
289. I will mail you that list if you don't have it.