The 35-year-old saga of Kryptos, an enigmatic sculpture containing four encrypted messages outside the CIA headquarters, just took a bizarre twist. Though cryptographers broke the first three passages ...

The 'untouched' Lorenz SZ42 machine was introduced by the Germans in 1942 after the Bletchley Park codebreakers led by Alan Turing cracked the Enigma. The Lorenz was even harder to decipher than the ...

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