Cryptography and Network Security: Principles and Practice introduces students to the compelling and evolving field of cryptography and network security. In an age of viruses and hackers, electronic eavesping, and electronic fraud on a global scale, security is paramount. The purpose of this book is to provide a practical survey of both the principles and practice of cryptography and network security. The first part of the book explores the basic issues to be addressed by a network security capability and provides a tutorial and survey of cryptography and network security technology. The latter part of the book deals with the practice of network security, covering practical applications that have been implemented and are in use to provide network security. The 8th Edition captures innovations and improvements in cryptography and network security, while maintaining broad and comprehensive coverage of the entire field. In many places, the narrative has been clarified and tightened, and illustrations have been improved based on extensive reviews by professors who teach the subject and by professionals working in the field.