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Summary

This is the ciphertext of the first part of the 14-part message which was delivered by the Japanese to the US Government on December 7, 1941. The source of the original document is: NARA. RG457 NSA Historical Cryptographic Collection. Copies of Messages 901, 902, 907 and 910 from Tokyo to Wash On 6 and 7 Dec 41. NR. 1815, Box 738.

Note the hand-written calculations at the upper right which deduce the initial positions of the stepping switches and the stepping order from the message indicator. First the additive for the month of December 1941 is subtracted, then the digits are rearranged according to the deduced transposition. The resulting number determines the starting positions, 9 for the sixes and 1, 24, 6 for the twenties, and the stepping order as number 4, which corresponds to 231.

Licensing

Public domain
This article or image contains materials that originally came from a National Security Agency (NSA) website or publication. It is believed that this information is not classified, and is in the public domain in the United States. See the privacy and security information.


Original upload log

date/time username resolution size edit summary
21:05, 18 December 2006 w:en:User:RashBold 452×776 111 KB This is the first part of the 14-part message which was delivered by the Japanese to the US Government on December 7, 1941

Image description page history

link date/time username edit summary
http://en.wikipedia.org/w/index.php?title=Image:Purplemsg.PNG&redirect=no&oldid=95171927 10:40, 11 September 2007 w:en:User:Dmcdevit
http://en.wikipedia.org/w/index.php?title=Image:Purplemsg.PNG&redirect=no&oldid=95171927 21:35, 18 December 2006 w:en:User:RashBold
http://en.wikipedia.org/w/index.php?title=Image:Purplemsg.PNG&redirect=no&oldid=95165959 21:05, 18 December 2006 w:en:User:RashBold
http://en.wikipedia.org/w/index.php?title=Image:Purplemsg.PNG&redirect=no&oldid=95165785 21:05, 18 December 2006 w:en:User:RashBold (This is the first part of the 14-part message which was delivered by the Japanese to the US Government on December 7, 1941)

Captions

Ciphertext, part 1, of the 14-part message which was delivered by the Japanese to the US Government on December 7, 1941

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Date/TimeThumbnailDimensionsUserComment
current16:29, 13 September 2007Thumbnail for version as of 16:29, 13 September 2007452 × 776 (111 KB)BetacommandBotTranswiki approved by: w:en:User:Dmcdevit This image was copied from wikipedia:en. The original description was: == Summary == This is the first part of the 14-part message which was delivered by the Japanese to the US Government on December 7, 1941

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