A single leaked hint exposed the CIA’s most puzzling code. But dozens of the world’s toughest ciphers are still waiting to be solved.

It was the spring of 1942. America’s back was against the wall. The Japanese Navy ruled the Pacific. Pearl Harbor was still in ruins. In a dim basement beneath Pearl, Commander Joseph Rochefort ...

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 ...