"In wartime they attack a part of the body that other weapons cannot reach in an attempt to affect the way which participants perform on the field of battle." (
Therefore the demonstrated tools refer to political propaganda in the two World Wars.
Propaganda has the ability to change a war, a natural evil, into a so-called "just" war. Violence then is supposedly defense, no more aggression.
TEXTBLOCK 1/1 // URL: http://world-information.org/wio/infostructure/100437611661/100438658552
David Kahn can be considered one of the most important historians on cryptography. His book The Codebreakers. The comprehensive history of secret Communication from Ancient Times to the Internet, written in 1996 is supposed to be the most important work on the history of cryptography.