"Those who delight in puzzles can find much to ponder on here," declared Science News Letter of this excellent introduction to cryptography. Concise and simple explanations cover transposition and substitution ciphers, codes, and their solutions. More than 150 problems provide practical applications as well as tests of ingenuity.
Brief overview of cryptography interspersed with historical tidbits. Good step-by-step instructions and explanations for encrypting, analyzing, and decrypting. Includes problems, solutions, and a short glossary.
An adequate introduction to pre-computer cryptography. It offers a little more history than some other, similar books, and quite a bit of practice material.