Security in Computing, Third Edition

2.4. Making “Good” Encryption Algorithms

So far, the encryption algorithms we have seen have been trivial, intended primarily to demonstrate the concepts of substitution and permutation. At the same time, we have examined several approaches cryptanalysts use to attack encryption algorithms. Now we examine algorithms that are widely used in the commercial world. Unlike the previous sections, this section does not delve deeply into the details either of the inner workings of an algorithm or its cryptanalysis. (We save that investigation for Chapter 10.)

What Makes a “Secure” Encryption Algorithm?

There are many kinds of encryption, including many techniques beyond those we discuss in this book. Suppose you have text to encrypt. How do you choose ...