Research over the last two decades has considerably expanded knowledge of Internet cryptography, revealing the important interplay between standardization, implementation, and research. This practical textbook/guide is intended for academic courses in IT security and as a reference guide for Internet security. It describes important Internet standards in a language close to real-world cryptographic research and covers the essential cryptographic standards used on the Internet, from WLAN encryption to TLS and e-mail security. From academic and non-academic research, the book collects information about attacks on implementations of these standards (because these attacks are the main source of new insights into real-world cryptography). By summarizing all this in one place, this useful volume can highlight cross-influences in standards, as well as similarities in cryptographic constructions. Topics and features: Covers the essential standards in Internet cryptography Integrates work exercises and problems in each chapter Focuses especially on IPsec, secure e-mail and TLS Summarizes real-world cryptography in three introductory chapters Includes necessary background from computer networks Keeps mathematical formalism to a minimum, and treats cryptographic primitives mainly as blackboxes Provides additional background on web security in two concluding chapters Offering a uniquely real-world approach to Internet cryptography, this textbook/reference will be highly suitable to students in advanced courses on cryptography/cryptology, as well as eminently useful to professionals looking to expand their background and expertise. Professor Dr. Jrg Schwenk holds the Chair for Network and Data Security at the Ruhr University in Bochum, Germany. He (co-)authored about 150 papers on the books topics, including for conferences like ACM CCS, Usenix Security, IEEE S&P, and NDSS.