The Enigma device used by the Axis powers was an electro-mechanical machine that resembled a typewriter, with three rotors that each had 26 possible positions, a reflector that sent the signal back ...

Think you’ve got what it takes to crack the code? Watch as I tackle this tricky lock puzzle — can it be unlocked before time ...

If you look at today’s prize cryptic crossword, you’ll see something fishy going on. The clues are full of references to espionage and intelligence work and we’re even told GCHQ have hidden one of the ...