Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent, but detailed, introduction to crypto and security

This book should appeal to both the beginner and the professional in network security. The book starts with very few assumptions about the existing security knowledge of the reader yet still manages to explain, in considerable depth, encryption and security protocols.Best of all, it's extremely well written, well illustrated and peppered with some good humour. A topic like this could be tedious to read, but this book isn't (although I have to admit, the chapter on Kerberos didn't quite spark me up the way the rest of it did!).The book has some excellent mathematical background for those who want to understand public key cryptography but aren't that familiar with modular exponentiation and the like. It also has detailed descriptions of a number of algorithms.In summary, an excellent all-rounder on this extremely important topic.