“The book has several new inclusions over its previous editions including the SHA-3 algorithm for hashing and ElGamal encryption. … The authors also include a textual context for each of the ciphers and hashing algorithms with both historical significance and potential application, which makes this an excellent reference book for graduate-level learners, researchers, and professionals. Overall, this work … offers an excellent view of the current state of cryptography. … Summing Up: Highly recommended. Graduate students, researchers/faculty, and professionals/practitioners.” (T. D. Richardson, Choice, Vol. 53 (11), July, 2016)

“This is a thorough introductory text on cryptography from an engineering viewpoint. It provides a good overview of the whole subject, including secret-key (‘symmetric’) and public-key methods, hash functions, and signing. There’s a 90-page appendix that summarizes the mathematics needed (mostly number theory, with some abstract algebra and probability). The book is well-written and easy to follow.” (Allen Stenger, MAA Reviews, maa.org, April, 2016)

“Delfs and Knebl in this book focus on the mathematical aspects of cryptography. … this book is best suited for a graduate course in mathematics. … recommend this book for readers with strong mathematical backgrounds who are interested in the foundations of the field.” (Burkhard Englert, Computing Reviews, March, 2016)