Gaining skills and knowledge required to create effective data security system This book updates readers with all the tools, techniques, and concepts needed to understand and implement data security systems. The author contributed to the design and analysis of the Data Encryption Standard (DES) encryption algorithm that is widely used symmetric-key. Comprehensive in its scope, this book begins with a discussion of the history of cryptography, including a description of the basic encryption systems and many of the encoding system used in the twentieth century. Three basic types of chapters is displayed to facilitate learning: Chapters that develop technical skills chapter describing the cryptosystem and present methods of analysis chapter that describes a cryptographic system, presents methods of analysis, and provide problems to test your grasp of the material and your ability to implement practical solutions With consumers becoming increasingly wary of identity theft and the company struggled to develop a safe, secure system, this book is essential reading for professionals in e-commerce and information technology.