Grill (cryptology)

The Enigma cipher machine
Enigma machine
Enigma rotors
Breaking Enigma
Polish Cipher Bureau Doubles Grill Clock Cyclometer Bomba Zygalski sheets Bletchley Park Banburismus Herivel tip Crib Bombe Hut 3 Hut 4 Hut 6 Hut 8 PC Bruno Cadix
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The grill method (Polish: metoda rusztu),^[1] in cryptology, was a method used chiefly early on, before the advent of the cyclometer, by the mathematician-cryptologists of the Polish Cipher Bureau (Biuro Szyfrów) in decrypting German Enigma machine ciphers.^[2] The Enigma rotor cipher machine changes plaintext characters into cipher text using a different permutation for each character, and so implements a polyalphabetic substitution cipher.