Instruct: Classify an Amazon review as either positive or negative.
Query: Practical not so practical

What's wrong with this book? There is no thorough explanation of the concepts of cryptography, he just starts off taking shotcuts and with code examples that are absolutely not mature.I have a theoretical background in cryptography, but often had to read the text many times over before I could understand what the author was trying to say.This is the starting point for a practical guide on java cryptography, an introduction, but by no means enough.I would have considered giving it 3 stars, weren't it not that het appendix A on Base64coding, another topic that the author doesn't treat, is completely missing !