Open Literature Versus Classified Literature
With the invention of radio, much of military communications went wireless, allowing the possibility of enemy interception much more readily than tapping into a landline. This increased the need to protect communications. By the end of World War I, cryptography and its literature began to be officially limited. One exception was The American Black Chamber by Herbert Yardley, which gave some insight into American cryptologic success stories, including the Zimmermann telegram and the breaking of Japanese codes during the Washington Naval Conference.
Read more about this topic: Books On Cryptography
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