193 1 year165438+1October 8th, French intelligence personnel met with Hans-Tiro Schmidt, the brother of German communication chief (he ordered the Germans to use Enigma cipher machine). Schmidt, who works in the German cryptology department, hates Germany, so he provided French intelligence personnel with two pieces of information about the operation of Enigma cryptograph and the internal circuit of the rotor. However, France still can't decipher its password, because one of the design requirements of Enigma cipher machine is to keep it highly confidential after being seized. At that time, the French army thought that even if the German code could not be deciphered, because the Treaty of Versailles restricted the development of the German army, we would not lose much if we met on the battlefield in the future, so we never studied it carefully after drawing the conclusion that the German code was decipherable.
Unlike France, the situation in newly independent Poland in World War I was very dangerous. Germany in the west was ceded to Poland according to the Treaty of Versailles, and the Germans held a grudge against it, while the Soviet Union in the east also coveted Polish territory. So Poland needs to know the internal information of these two countries at all times. This dangerous situation has created a large number of excellent cryptographers in Poland. It is easy for them to monitor the communication system inside the German army, but the Enigma cipher machine started by the German army in 1926 caused them great difficulties.
192 1 year, Poland and France signed a military cooperation agreement. At Poland's insistence, France handed over the information obtained from Schmidt to the Poles. It is this shortcoming that the Poles cracked the Enigma cipher machine for commercial use.
However, in 194 1 year, the British navy captured the German submarine U- 1 10 on the warship of Captain Joe Baker-creswell, and only kept this secret from American President Roosevelt. King George VI of Britain praised this incident as the most important event in the whole naval battle of World War II. This enabled the German cipher machine, which even the mathematical genius Turing could not decipher, to be deciphered, and the "bomb" machine specially designed by the Allied Forces for deciphering Ingmar's cipher also greatly improved the working efficiency of Blackley Park.
After the war, the British didn't publicly crack the Enigma code because they wanted the British colony to use the machine. 1967, the first book about Enigma decoding was published in Poland. 1974, the book The Ultra Secret, written by F.W. botham, an Englishman working in Blackley Garden, was published, which made the outside world widely aware of the hardships of allied cryptographers in World War II.