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| Keywords: NSA Cipher Text Auto Key diagram.tiff en NSA Cipher Text Auto Key diagram showing their method for self-synchronizing encryption systems 2015-10-14 http //www governmentattic org/18docs/Hist_US_COMSEC_Boak_NSA_1973u pdf A History of U S Communications Security; the David G Boak Lectures National Security Agency NSA Volumes I 1973 Volumes II 1981 partially released 2008 additional portions declassified October 14 2015 US National Security Agency other versions PD-USGov NSA encryption devices Uploaded with UploadWizard | ||||