Astra rebuilt the Germans’ secret letter grid, then found a date error historians can’t explain.

In March 1809, Europe was perched on the precipice of war as Napoleon's forces braced for an attack from Austria. Intent on ...

AI may have cracked a 370-year-old cipher in 44 minutes. The harder question is whether it discovered the answer, remembered it, or merely guessed well.

The cipher controversy is back. The Intercept, an American media outlet known for unearthing secret documents, has claimed to have got hold of the text of the cipher that was at the centre of Imran ...

This brief message, which former NASA administrator George Low named ‘The Martian Cipher’, was intercepted in 1969. It took the space agency almost 50 years to decode it. This deciphering is arguably ...