Cozzens (Rutgers U.) and Miller (Williams College) review classical methods of encrypting messages and introduce modern encryption and decryption methods based on binary expansions, recurrence relations, graph theory, public key, digital signatures, and RSA. Intended for non-math majors, the textbook requires only basic algebra and elementary number theory to understand the systems and methods. Annotation ©2013 Book News, Inc., Portland, OR (booknews.com)