Course in Number Theory and Cryptography

. . . both Gauss and lesser mathematicians may be justified in rejoic­ ing that there is one science [number theory] at any rate, and that their own, whose very remoteness from ordinary human activities should keep it gentle and clean. - G. H. Hardy, A Mathematician''s Apology, 1940 G. H. Hardy would have been surprised and probably displeased with the increasing interest in number theory for appl...