Four-rotor German Naval Enigma cypher machine, MK 4, 1942.

Filipovic, Stefan

 
Four-rotor German Naval Enigma cypher machine, MK 4, 1942.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

Introduced on Atlantic U- Boats in February 1942, the code produced by the MK4 Enigma was not broken until December 1942, after the capture of cypher documents from U-559 in the Mediterranean. The cracking of German cypher codes by Allied intelligence was a major achievement in cryptanalysis and played a key role in the outcome of the North Atlantic U-boat engagements.

© Science Museum / Science & Society Picture Library

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