After a 35-year quest, the final solution to a famous puzzle called Kryptos has been found. Two writers discovered the fourth ...

For 35 years, cryptographers have tried to crack the hidden code in the imposing copper sculpture in the courtyard of the CIA’s Virginia headquarters.

John Bolton, the former US national security adviser, has been criminally indicted. Mr Bolton, who has been under ...

It feels like every other day, we hear about some new digital disaster. From little glitches to massive leaks, the internet ...