Decrypting the message is done by reversing the process: subtracting the key from the ciphertext and then running it through the polybius square. The final row is the ciphertext which can be passed on in a more secure fashion. SCHOOL we get the Square shown on the right. Extended key: TRONTRONTRONTRONTRONTRONTRONTRON.First, a mixed alphabet Polybius square is drawn up 1 2 3 4 5 1. Compressed message: NOITSTHECODEBREAKERNOMORESECRETS (11+1526)mod 26 Ciphertext: 00- > A Plaintext: l -> 11 Encryption.First we create a compressed version of the message and extend the key so that it’s the same length as the message: No more secrets”, a keyword of “BISHOP”, and a key of “TRON”, here is how it would work. The numbers for the encoded plaintext are added to those for the encoded key and the final ciphertext is the result.įor the message “No, It’s THE code breaker. If it is shorter than the message it is extended through repetition. It is run through the polybius square as well. Each character of the plain message is replaced by a. The second part of the Nihilist Cipher is the key, which is used to encrypt the plaintext message. The Polybius cipher, also called Polybius square, is a substitution cipher using a square grid.
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