Cipher Compromises
Comments on "Security Of U.S. Military Communications"
Comments on Cmdr Weeks Paper
Drawings of Cipher Messages
Loan of Documents from Op-202 Archives
Memorandum for Mr. Friedman In Reference to the Degree of Confidence We Can Have That the Germans Are Not Reading Our High-Grade Machine Cipher Traffic
Security of Information Derived from Field Intercept Sources
Security of Our High-Grade Cryptographic Systems
Security of United States Communications