The author includes not only information about the most important advances in the field of cryptology of the past decade-such as the Data Encryption Standard (DES), public-key cryptology, and the RSA algorithm-but also the research results of the last three years: the Shamir, the Lagarias-Odlyzko, and the Brickell attacks on the Knapsack methods; the new Knapsack method using Galois fields by Chor and Rivest; and the recent analysis by Kaliski, Rivest, and Sherman of group-theoretic properties of the Data Encryption Standard (DES).
Even though this 80s crypto book is dated (e.g. Knapsacks) and the examples are given in Pascal, I still have a soft spot for authors that make cryptography topics accessible from a coding perspective. Author has a good intuitive understand of many of the concepts, so this book is not just a topical rehash of what you may already have in other books.