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.

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