Review o f Privacy on the Line 4 Author: Whitfield Diffie and Susan Landa u Published by MIT Press 199 8 Hardcover, $25 .00 360 page s ISBN 0-262-04167- 7 Review by Joseph Maklevitch York College (CUNY ) joeyc@cunyvm .cuny .ed u In his book A Mathematician's Apology, the pacifist G .H. Hardy attempted to take comfort fro m the fact that number theory, his area of specialty, might never be put to any use, especially use tha t Hardy would not have approved of. Hardy was naive . Stanislas Ulam, the "pure" mathematician turned physicist, is credited with being the co-inventer of the hydrogen bomb - a dubious honor . Yet the path that ideas will lead to, even those initially developed for reasons of unlikely value t o mankind, are difficult to chart . What is perhaps closer to the truth than Hardy's hope is a though t of the topologist Leo Zippin : if some mathematician is clever enough to find what seems to b e hopelessly abstract results, some other mathematician will be clever enough to find a use for th e results . Many theorists in mathematics and computer science today live in
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