Editing Bibliography of cryptography (section)

==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 1931 book ''[[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]].