Cryptography and Security Services: Mechanisms and Applications

I see that he wanted to make it easy, but perhaps he should have made it a bit more difficult. There is a lack of explanation in many area's of the book. Overall, not a nice flow of information either. Don't bother trying to review what you understood by answering questions at the end of the chapter. Many of them frequently ask questions that were simply never mentioned in the chapter or the entire book for that matter. I would avoid this book at all costs.