10.2. Symmetric Encryption
We were introduced to symmetric encryption in Chapter 2. In this section, we begin with a review of the two fundamentals of symmetric encryption, confusion and diffusion, as they are represented in modern algorithms. We also review cryptanalysis so that we can appreciate how encryption can fail. Finally, we study the details of the two main symmetric systems, DES and AES.
Fundamental Concepts
To refresh your memory and prepare you for a detailed description of DES and AES, we present here a review of important points from Chapter 2.
Confusion and Diffusion; Substitution and Permutation
Recall from Chapter 2 that confusion is the act of changing plaintext so that its corresponding plaintext is not apparent. Substitution ...
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