Cryptography

Cryptology is the science of coding and decoding information. It is divided into Cryptography, which concerns designing cryptosystems, and Cryptanalysis, which is concerned with breaking cryptosystems.

Books
Handbook of Applied Cryptography by Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone (free download as pdf or ISBN 0849385237) Applied Cryptography: Protocols, Algorithms, and Source Code in C by Bruce Schneier (ISBN 0471117099)

links

 * cryptographyworld.com - An Introduction into Cryptography
 * www.iacr.org - International Association for Cryptologic Research (IACR)
 * www.nsa.gov/kids/ - CryptoKids™
 * Crypto Wiki