NSA
MIL CRYPT I
- ,,..,,~·==============~=====================;tWAR DEPARTMENTOFFICE OF THE CHIEF SIGNAL OFFICERWASHINGTONMILITARY CRYPTANALYSISPar.t IMONOALPHABETIC SUBSTITUTION SYSTEMSByWILLIAM ·F. FRIEDMANPrincipal Cryptanal11atChief of Signal Intelligence SectionWar Plam and Training DivisionPREPARED UNDER THE DIRECTION OP THBCHIBP SIGNAL Ol'Ji'ICERtrNI'i'ED STA'tlSGOVERNMENT PRINTING OPFICEwA.SlllNGTON I 1918-- 1 of 76 --MILITARY CRYPTANALYSIS, PART I. -MONOALPHABETIC SUBSTITUTIONSYSTEMSB1lction Paragraphs...
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Internal Periodicals & Publications
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Internal Periodicals & Publications
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7528.6 KB