Implementing Cryptography Using Python by Shannon W. Bray

Author:Shannon W. Bray [Bray, Shannon W.]
Language: eng
Format: epub
ISBN: 9781119615453
Publisher: Wiley
Published: 2020-08-11T00:00:00+00:00

Figure 4.11: Vigenere_crypto.py

Summary

This chapter was fairly heavy on the important mathematical concepts you need to break classical ciphers. You may find yourself referring to this chapter several times as you progress through the remaining chapters. Before moving on to the next chapter, make sure you have a pretty good understanding of modular arithmetic and how to find the inverse. In addition, you should have an understanding of basic group theory, the Chinese remainder theorem, and solving linear equations. A number of Python libraries are available that will simplify a great deal of the concepts offered in this chapter. It is vital that you remember the importance of using cryptographically secure pseudorandom generators and also understand how to determine the random number generation that is offered using C's rand() function. Frequency analysis will be your greatest ally. As you generate decryption keys, knowing how frequency analysis works will help you decrypt many of these ciphers without knowing the keys or key lengths.

We will be continuing our exploration of cryptanalysis as you progress through the remaining chapters, but you should have a good understanding of how to decrypt a wide variety of cryptographic schemes.

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