Kriegsmarine

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M4-UKW = B

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M4-UKW = C

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BASIC PROCEDURE

 

Decrypting a Kriegsmarine 4-rotor message

 

Note:  The Kriegsmarine 4-rotor Enigma machines (M4) are more complex than the 3-rotor Wehrmacht versions.  This procedure takes for granted that you already know the basic Enigma operating steps that are used with the 3-rotor machines and that you are ready to advance to a more challenging level of Enigma activity.  We have selected the sample message from the Basic Procedure Encrypting and Sending a Kriegsmarine 4-Rotor Message as our example in this procedure. You will, of course, use your own received message to decrypt.

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To view this entire procedure, please click on "The Kriegsmarine Basic Decrypting Procedure" bullet below.

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Print-out a paper copy of all of these documents:

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• The Kreigsmarine Basic Decrypting Procedure

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• Inner Settings

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• Outer Settings

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• Bigram Table