AMERICAN SYSTEMS

3.695253UNCLASStEIED.·;,'I.··•.American Systems in the Revolutionary WarA Brief HistoryThis is a chapter from an unpublished history writtenby members of the staff of the U.S. Army Signal SecurityAgency during World War II. The complete history isto be published as part of the United States Cryptolo~icHistory series.The simplest form of substitution cipher is, of course,the monoalphabetic, so it is not surprising to find thatciphers of this type were used by Americans in theRevolutionary period....