MIL CRYPT IV

—Restricted—WAR DEPARTMENT ini OFFICE OF THE CHIEP SIGNAL OFFICER || WASHINGTON: MILITARY CRYPTANALYSISi Part IV |A |pt ——Declassified and approved for release by NSA on 11-09-2005 pursuant toE.O. 12958, as amended—Restricted—WAR DEPARTMENTOFFICE OF THE CHIEF SIGNAL OFFICER‘WASHINGTONMILITARY CRYPTANALYSISPart IVTRANSPOSITION AND FRACTIONATING SYSTEMSByWILLIAM F. FRIEDMANPrincipal CryptanalystSignal Intelligence Service‘|I|,| MILITARY CRYPTANALYSIS, PART IV.] TRANSPOSITION AND FRACTIONATING SYST...