La Descifradora «Enigma»

El sistema de cifrado que sostuvo al aparato militar del Tercer Reich

During World War II, the German army used an encryption machine called Enigma to protect its communications. Originally designed by the German company Scherbius & Ritter in 1918, it was adopted by the German Navy in 1926 and quickly spread to all branches of the armed forces. Its ease of use and apparent invulnerability made it a key element of the Nazi military apparatus..

The functioning of Enigma combined electrical and mechanical mechanisms. It featured a keyboard, a light panel, and a series of interchangeable rotors that allowed millions of possible combinations. Each time a key was pressed, the rotors turned, altering the circuit and generating a different encryption. This complexity prevented the appearance of detectable patterns, making it nearly impossible to decipher a message without knowing the exact daily configuration.

The procedure was simple yet effective: operators received a monthly booklet containing the daily keys. Each message had to begin with the indication of the temporary key used for that specific encryption. This key was typed twice, as it was believed the duplication strengthened security. Paradoxically, this became one of the flaws that allowed the Allies to begin breaking the code.

One of the key names in this effort was Joan Clarke, a brilliant British cryptanalyst who worked at Bletchley Park alongside Alan Turing. Clarke played a crucial role in breaking the naval traffic encrypted by Enigma, particularly that used by German submarines (U-boats). Her work made it possible to anticipate attacks, redirect convoys, and save thousands of lives.

Although Clarke was decorated in 1947 with the Order of the British Empire, her contribution remains little recognized. Her story is a reminder not only of the importance of intelligence in wartime, but also of the often-overlooked talent of women who changed the course of history from behind the scenes.

Gestapo Headquarters

Chapter 1

...—Since the capture of U-110, we can no longer rely on secure transmissions. The British got hold of the Enigma machine, along with its codes and the operations manual…

Did you know…?

🔹Before the British work at Bletchley Park, it was Polish cryptographers who, through a combination of mathematics and espionage, managed to reconstruct the functioning of Enigma in the 1930s. In 1939, they shared their findings with French and British intelligence, laying the groundwork for its eventual decryption.

Joan Clarke