This book introduces a concept of Rotation, that vital to any modern cryptography, especially Advanced Encryption Standard (AES). Firstly, the book presents an introduction a bout classical and non-classical cryptography and brief overview of cryptography throughout the history of human. This book should be useful especially for the researchers in the field of cryptosystems, or anyone else interested in the field of cryptology.

Mohamed is a researcher into fields Neural Networks, Image processing and cryptography with over 26 years of experience in programming, analysis, and security. He has an MSc. in Computer Science and Info., ISSR, Cairo University. Now he Prepare the Final Stage of PHD, FCI, Cairo University. He is Currently General Manger in Egyptian Customs Authority.