Once the messages were broken, it became clear why my bombe-simulator had failed. Once I had the full ring setting, I was able to reconstruct the Grundstellung of the second message. Although the Grundstellung was missing from that intercept, I was able to use the Enigma settings from that break to decipher the first message and use its Grundstellung and enciphered message key to work out the full ring setting. I then tried them with my hillclimber, and it eventually reached a break on the second of the two messages. I had tried my bombe-simulator on both of these messages, with the word "Taetigkeitsberiqt" as a crib for the message beginnings but without success. Like the first two that I had broken before, these turned out to be just routine activity reports (Tätigkeitsberichte) but evidently these are on a different key-net. I've solved the other two Luftwaffe messages of 7 March 1940, from the PDF file of radio messages intercepted by the Swedish police. The other two messages from page 40 do not break on either key they must be either Army or a different Luftwaffe key. I think the one from page 47 is probably in the Luftwaffe key called "Blue" by the Allies this key was used only for practice messages, and the plaintext of this message appears to be just a passage copied from a radio manual. The first two are definitely Luftwaffe, probably in the key called "Red" by the Allies. However, I have broken the first two Luftwaffe messages from page 40, and also the one from page 47, with my hillclibmer. I've tried my hand at breaking some of these, both with a hillclimber and with my bombe simulator, but so far without success in the case of the Naval messages. The pages of the PDF seem to run in more or less reverse chronological order - for example, the intercepts on page 40 are from the 7th of March 1940, and those on page 47 are from the 20th of February 1940. Most of these were intercepted by the police radio station at Norrköping. The naval Enigma intercepts are on pages 22, 23, 24, 25, 37, 39, 40, 47, 49, 69, 70, 71 and 81 of the PDF and the five Heer/Luftwaffe intercepts are on pages 40 and 47. It contains a number of radio messages intercepted by the Swedish security police in December 1939 and in February, March and April 1940, including more than twenty intercepts that, judging from their formats, are almost certainly naval Enigma messages and also a few that look like either German Army (Heer) or Air Force (Luftwaffe) messages. Signalspaning: Link Introduction - The Norrköping Enigma messagesĮxample While searching for information about the Allies’ code-names for different Enigma key-nets, I found an interesting PDF document.
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