polyalphabetic substitution cipher

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polyalphabetic substitution cipher

[‚päl·ē‚al·fə′bed·ik ‚səb·stə′tü·shən ‚sī·fər]
(communications)
A cipher that uses several substitution alphabets in turn.
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The encryption process was based on the Vigenere cipher, which is a polyalphabetic cipher [36].
The cryptosystem of this project is based on the Vigenere cipher, which is a polyalphabetic cipher. Polyalphabetic ciphers are multi-substitution ciphers, which means that each letter in the plaintext is substituted in different forms.
Between 1858 and 1868 he invented four and recorded them in his diary: two matrix ciphers and two polyalphabetic ciphers: the Telegraph Cipher and the Alphabet Cipher.
The firstofCarroll's polyalphabetic ciphers, which he named "TheAlphabet Cipher," is a kind of Vigenere cipher, and usesthe following table:
Thesecond of Carroll's polyalphabetic ciphers, called"TheTelegraph Cipher," is a "kind of Beaufort Cipher.