designer today requires a comprehensive understanding of applied cryptography. After the introduction of cryptography and data security, the authors describe the main techniques in modern cryptography, with the chapters dealing with stream ciphers, Data Encryption Standard (DES) and 3DES, Advanced Encryption Standard (AES) block cipher, RSA cryptosystem, public key cryptography based discrete logarithm problem, elliptic curve-cryptography (ECC), digital signatures, hash functions, Message Authentication Codes (MACS), and methods for key establishment, including certificates and public key infrastructure (PKI). Throughout this book, the authors focus on communicating the importance and keeping mathematics to a minimum, and they move quickly from the basics to describe the practical implementation, including new topics such as cipher mild to RFIDs and mobile devices, and the current key-length recommendations. The author has considerable experience teaching applied cryptography for engineering and computer science students and professionals, and they make extensive use of examples, problems, and review chapters, this book offers website whereas slides, projects and links to further resources.?