Abstract
The article discusses the organisation and effects of Polish radio intelligence operations on the German direction in the 1930s. It presents the inside story of the breaking of Enigma codes by Polish mathematicians. Thanks to this significant success, the Second Department of the Polish General Staff obtained a great deal of valuable information about the military and political situation of the Third Reich. Also, the cooperation between the Polish military intelligence and special services of France and Great Britain in radio intelligence is depicted. The text systematises and clarifies our knowledge of the work of the Polish Cipher Bureau in the field of Enigma decryption.
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