Adjective
polyalphabetic (not comparable)
Describing a substitution cipher in which plaintext letters in different positions are enciphered using different substitution alphabets.
Enigma's security came from using several rotors in series (usually three or four) and the regular stepping movement of the rotors, thus implementing a polyalphabetic substitution cipher. Source: Internet
Modern stream ciphers can also be seen, from a sufficiently abstract perspective, to be a form of polyalphabetic cipher in which all the effort has gone into making the keystream as long and unpredictable as possible. Source: Internet
It produced a polyalphabetic substitution cipher, but unlike Enigma, was not a rotor machine, being built around electrical stepping switches. Source: Internet
In a polyalphabetic cipher, multiple cipher alphabets are used. Source: Internet
Simple ciphers were replaced by polyalphabetic substitution ciphers (such as the Vigenère ) which changed the substitution alphabet for every letter. Source: Internet
The method of filling the tableau, and of choosing which alphabet to use next, defines the particular polyalphabetic cipher. Source: Internet