Cryptography and Network Security 

This book is meant for single-semester courses on courses in cryptography and security. It places security as a paramount concern of the administrator. The author considers various technologies relating to cryptography and security as having matured and takes you through various products on enforcing security. Unlike most books that talk only theory or practice, this book gives you both, using a clever combination of surveys on security and cryptography practices and how the capability can be optimized. A must-have for anyone with an interest in either field.