Abstract

A 1995 article in this journal presented a study by James Gillogly entitled “Ciphertext-Only Cryptanalysis of Enigma” [7, p. 405]. In this paper I will make improvements on Gillogly's techniques by choosing a more effective statistical test and an improved algorithm which allow me to decipher a 500-letter message encrypted by an Enigma machine with 10 plugs.

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