Chris Christensen Department of Mathematics and Statistics Northern Kentucky University

Jerzy Rozycki Henryk Zygalski Marian Rejewski

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6 ways to order the rotors. 17,576 ways to set the rings against the rotor cores. 105,456

6 ways to order the rotors. 17,576 ways to set the rings against the rotor cores. 100,391,791,500 ways to set the plugboard. 10,586,916,764,424,000

RTJ WAH WIK First Enigma pair Ciphers 1 and 4 Z and Z + 3

RTJ WAH WIK DQY DWJ MWR First Enigma pair Ciphers 1 and 4 Z and Z + 3 Second Enigma pair Ciphers 2 and 5 (Z + 15)+1 and (Z + 15)+1+3

RTJ WAH WIK DQY DWJ MWR HPB RAW KTW First Enigma pair Ciphers 1 and 4 Z and Z + 3 Second Enigma pair Ciphers 2 and 5 (Z + 15)+1 and (Z + 15)+1+3 Third Enigma pair. Ciphers 3 and 6 (Z + 18)+2 and (Z + 18)+2+3

RTJ WAH WIK DQY DWJ MWR HPB RAW KTW Middle rotor offsets Z Z + 23 (Z + 23) + 25 Left (slow) rotor offsets Z Z + 12 (Z+ 12)+4

Alan Turing Gordon Welchman

Harold “Doc” Keen

Joe Desch

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