The book is organized around four main themes: * Cryptography: classical cryptography, symmetric key cryptography, public key cryptography, hash functions, random numbers, information hiding, and cryptanalysis * Access control: authentication and authorization, password-based security, ACLs and capabilities, multilevel and multilateral security, secrecy and control channels conclusion, BLP and Biba's models, firewalls, and intrusion detection systems * Protocols: simple authentication protocols, session keys, perfect forward secrecy, timestamps, SSL, IPSec, Kerberos, and GSM * Software: flaws and malware, buffer overflows, viruses and worms, software reverse engineering, digital rights management, secure software development, and operating system security Additional features include many figures and tables to illustrate and explain complex topics, as well as problems-ranging from basic to challenging-to help readers apply their newly developed skills. Students and professors in the field of information technology, computer science, and engineering, and professionals working in the field will find useful reference for solving their information security problems. A solution presents a detailed Instructor's Manual for all the problems in the book is available from the Wiley editorial department. An Instructor Support FTP site is also available.