Grill (cryptology)
Cryptology method / From Wikipedia, the free encyclopedia
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Not to be confused with Grille (cryptography).
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.