File:Preliminary Historical Report on the Solution of the "B" Machine.pdf

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Original file ‎(1,270 × 1,585 pixels, file size: 753 KB, MIME type: application/pdf, 12 pages)

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Report on the solution of the World War II Japanese Type B Cipher Machine, also known by its codename "Purple"

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Description
English: Report on the solution of the World War II Japanese Type B Cipher Machine, also known by its codename "Purple"
Date
Source

National Security Agency

https://www.nsa.gov/Portals/70/documents/news-features/declassified-documents/friedman-documents/reports-research/FOLDER_211/41760789079992.pdf
Author William F. Friedman

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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