Chapter Three. Symmetric Cryptography

The most basic problems of cryptography have always been confidentiality, integrity, and authentication. The traditional approach to these problems has been to apply solutions based on symmetric cryptographic algorithms. This chapter introduces the concepts of symmetric cryptography and provides examples of how to implement symmetric cryptography solutions using the System.Security.Cryptography namespace in the .NET Framework. In particular, we look at the DES, Triple DES, Rijndael, and RC2 symmetric algorithms and how to use them.