Title supplied by cataloger. On verso of page 1: No. 5. Laid inside the book in an envelope labeled: Rules for working Cipher "No. 5". Envelope has printed on it: War Department, Official Business, Assistant Secretary of War. The rules are written on yellow paper, same as EC 49, six pages. Ms. page numbers. "1864" and "1865" are included on p. 4, leading to the cataloger's suggested date.
Cryptography--Handbooks, manuals, etc Cryptography--United States United States--History--Civil War, 1861-1865--Communications--Sources United States--History--Civil War, 1861-1865--Cryptography United States. Military Telegraph Corps
Source
Thomas T. Eckert papers, 1861-1877 (bulk 1862-1867) Thomas T. Eckert Papers, Decoding the Civil War
Provenance
Purchased in part by the Library Collectors' Council from Seth Kaller, January 21, 2012.
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