Category: Monoalphabetic Cipher

Machine Cryptanalysis of Basic Cryptosystems by James Pate Williams, Jr. BA, BS, MSwE, PhD

In Winter and Spring 2018 I wrote a simple C# computer program to perform machine cryptanalysis of the following basic (elementary and easily breakable) cryptosystems:

  1. Affine Cipher Operating on Monographs and Digraphs
  2. Matrix Cipher
  3. Mono-alphabetic Cipher
  4. n-Rotor with Shifting Polyalphabetic Cipher

The key ingredient in this program is a relatively extensive English language dictionary.

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