Facts101 is your complete guide to Cryptography and Network Security. In this book, you will learn topics such as Traditional Symmetric-Key Ciphers, Mathematics of Cryptography, Introduction to Modern Symmetric-Key Ciphers, and Data Encryption Standard (DES) plus much more. With key features such as key terms, people and places, Facts101 gives you all the information you need to prepare for your next exam. Our practice tests are specific to the textbook and we have designed tools to make the most of your limited study time.