The codebreakers of Bletchley Park not only broke into the secrets of the German Enigma machine, but also succeeded in cracking the main Russian machine ciphers. The success of British cryptanalysts ...
The cipher substituted numbers for letters - in this case each letter had four number substitutions - to keep communications indecipherable to those without the key An English Civil War cipher has ...
The remaining three coded messages have intrigued amateur detectives for more than 50 years who have hoped that solving them would lead to identifying the culprit. Dr Samuel Blake, a mathematician ...
In 1931, Herbert O. Yardley published a tell-all book about his experiences leading a covert government agency called the Cipher Bureau Peter Zablocki - History Correspondent Herbert O. Yardley ...
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