Keywords: Cipher No 9, Union Telegraphic Cipher Book, c. 1861-1862, used by General Joseph Hooker at the battle of Chancellorsville, Virginia, to secure messages sent by telegraph - National Cryptologic Museum - DSC07713.JPG en Exhibit in the National Cryptologic Museum Fort Meade Maryland USA All items in this museum are unclassified; items created by the United States Government are not subject to copyright restrictions 2013-03-29 10 09 06 own Daderot cc-zero Books and manuscripts in the National Cryptologic Museum Uploaded with UploadWizard Codebooks |