Samson P. Danziger

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Classical Cipher Encrypter/Decrypter






Encrypt and decrypt classical ciphers, using Java.

This is not to be used for the National Cipher Challenge - that would be cheating!!!


Currently implemented ciphers:

  • Atbash: encryption and decryption (there is only one key)
  • ROT13: encryption and decryption (there is only one key)
  • Caesar Shift: encryption and decryption, with a key or force search
  • Substitution Cipher: encryption and decryption with or without a key
  • Vigenere Cipher: encryption and decryption with a key, a key length or no key
  • Affine Shift: encryption and decryption with or without a key.

Planned Ciphers:

  • Autokey
  • Beaufort
  • Hill
  • Unknown (attempts decryption even if the cipher is unknown)

Extras:

  • There is a GUI
  • I currently implements Encryption and Decryption of Atbash, ROT13, Caesar Shift, Substitution Cipher, Vigenere Cipher and Affine Shift
  • It can also somewhat infer spaces, but this needs work.
  • It has various statistical methods for checking how English a string looks, including:
  • Chi Squared Statistic
  • Index of Coincidence
  • NGram Scoring