Cryptographic and cryptanalytic algorithms (WIP)

• Cryptanalysis:

  • Frequency analysis tools

• Cryptograhy:

  • Simple Caesar shift
  • Vigenere cipher
  • Columnar transposition cipher
  • simple Diffie-Helman public key distribution

TODO:

• Language detection and translation:
  • https://github.com/seejohnrun/easy_translate
• Word similarity:
  • https://github.com/anjlab/rubyfish
  • https://github.com/dbalatero/levenshtein-ffi

Sources for letter frequencies:

• Single-letter / unigram: http://www.math.cornell.edu/~mec/2003-2004/cryptography/subs/frequencies.html
• Digram: http://norvig.com/mayzner.html
• Trigram and quadrigram: http://www.cryptograms.org/letter-frequencies.php
• First letter: http://en.wikipedia.org/wiki/Letter_frequency#Relative_frequencies_of_the_first_letters_of_a_word_in_the_English_language