Classical Cryptography Course, Volume 2,

The lessons in this book, a continuation of Volume 1, cover the solution of polyalphabetic substitution ciphers in the Vigenhre family, plus the difficult aperiodic cipher systems. The theory of coincidences and statistical tests, including the Kappa, Chi, and Phi tests, are discussed in detail. A variety of transposition ciphers are covered. The book concludes with an historical look at codes and cipher machines. Of particular value is the expanded bibliography and a detailed section of Internet websites and resources concerning cryptography and cryptanalysis.