CIPHER/POLYALPHABETIC CIPHERS
Polyalphabetic ciphers
4More than one substitution alphabet is used in a single message, so a letter's ciphertext changes with its position.
Renaissance · Polyalphabetic · Field
Alberti Disk
Leon Battista Alberti built a brass disk in the 1460s and, with it, crossed the line that separates classical from modern…
TEAR HTKU WTOU…
Modern · Polyalphabetic · SpecialistEnigma Rotor Machine
Enigma is the cipher that looks unbeatable on paper and lost a war in practice. Its key space was in the hundred-sextillions and…
PINOV NX…
Renaissance · Polyalphabetic · FieldPorta Cipher
Giovanni Battista della Porta published this tableau in 1563 and solved a problem that had annoyed cryptographers for a century…
AAAANZSVJFWOPY…
Renaissance · Polyalphabetic · FieldVigenere Tableau
The Vigenere cipher was called *le chiffre indéchiffrable* — the indecipherable cipher — for roughly three hundred years, and the…
UYEDGPDRWEFDBWJT…