"A cipher is constantly under attack from codebreakers. When the codebreakers have developed a new weapon that reveals a cipher's weakness, then the cipher is no longer useful. It either becomes extinct or it evolves into a new, stronger cipher. In turn, this new cipher thrives only until the codebre"
"Winston Churchill was full aware of the importance of the Bletchley decipherments, and on September 6, 1941, he visited the codebreakers. On meeting some of the cryptanalysts, he was surprised by the bizarre mixture of people who were providing him with such valuable information...Churchill muttered"