See This Photo? It’s How America Made Sure Hitler Never Conquered the World

See This Photo? It’s How America Made Sure Hitler Never Conquered the World

Warfare History Network, Brooke C. Stoddard

Security, Europe

The casual reader of World War II history will come across the assertion that the Allies in Europe were reading the German codes. This secret, which the Allies guarded most assiduously, was called ULTRA. It was a really big deal. 

Key point: The West’s most brilliant minds saved the day.

The casual reader of World War II history will come across the assertion that the Allies in Europe were reading the German codes. This secret, which the Allies guarded most assiduously, was called ULTRA.

Although the codebreaking—kept secret until the 1970s—is now reported routinely in histories of World War II, the reader would make a mistake assuming that the reading of codes was universal, or that it was somehow easy. Neither is true.

Variations of the Enigma Machine

Different branches of the German armed services used variations of the Enigma machine, and although the British could decrypt some of the radio messages from them early in the war, they could not decipher all of them. During the war, the Germans improved the Enigmas by adding a fourth wheel or changing encryption methods that had weakened the system’s security. In addition, the German Army used a non-Enigma enciphering system based on Teletype machinery. This was used for high-level command communications and became operational after the Enigmas.

As to the notion that the codebreaking was easy or merely followed on a single flash of brilliance early in the war, both are false. The codebreaking of the Allies was the result of applied brainpower, then applied machinery and man- (and women-) power, as well as sheer luck that was akin to the tremendous industrial effort of the United States during wartime production. The work was a huge project consuming massive resources, mechanical as well as mental. It was so massive, in fact, that the Germans believed it could not be done, and that their codes were safe from decryption analysis. This is why they never quite caught on to the fact that their radio transmissions were in part being read by their enemies.

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