Polyalphabetic Substitution Ciphers

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A list of Polyalphabetic Substitution ciphers

• Autokey Cipher

  The Autokey cipher is closely related to the Vigenere cipher, it differs in how the key material is generated. The Autokey cipher uses a key word in addition to the plaintext as its key material, this makes it more secure than Vigenere.

• Beaufort Cipher

  Very similar to the Vigenere cipher, but slightly different algorithm.

• Porta Cipher

  The Porta cipher is a polyalphabetic substitution cipher that uses a keyword to choose which alphabet to encipher letters.

• Running Key Cipher

  The Running Key cipher is similar to the Vigenere cipher, but the key is usually a long piece of non-repeating text. This makes it harder to break in general than the Vigenere or Autokey ciphers.

• Vigenère and Gronsfeld Cipher

  A more complex polyalphabetic substitution cipher. Code is provided for encryption, decryption and cryptanalysis.

• Enigma Cipher

  The Enigma cipher was a field cipher used by the Germans during World War II. It was cracked by British and Polish cryptographers.