The third edition of this best-selling text provides unparalleled coverage of the use of cryptographic protocols that establish the steps that must be taken before any type of secret transmission can be completed. The author shows readers how the various parties to the transaction establish their cryptographic identities or keys, covers many of the cryptographic tools used in network security, and discusses topics that include copyright protection techniques and public key infrastructure. Cryptography: Theory and Practice, Third Edition is an outstanding text for senior undergraduate and graduate courses but also a useful reference for professionals interested in network security and cryptographic protocols.