Author: served in the U.S. Navy from 1944 to 1946,
Title: Masked Dispatches: Cryptograms and Cryptology in American History, 1775-1900.
Description: Natl Security Agency, Center for Cryptologic Hist., (2002). 2nd ptg. VG lg sz PB updated from previous edition. This forms a backdrop for understanding modern cryptology and its role in the growth in the U.S. Cryptology, the art and. science of code-breaking (cryptanalysis) depends on the prevailing state of technology and the perception of threat.

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