A second world war Enigma coding machine. Photograph: PA
Richard Norton-Taylor, the Guardian's security editor, provides an intriguing challenge in today's paper. GCHQ, the British government's intelligence service headquarters, has launched a Christmas code cracker quiz in a bid to attract new recruits.
This cryptanalytic challenge is way beyond my capabilities, although would-be sneaky-beakies (squaddie slang for members of the intelligence fraternity) may fare better. Let us know how you get on in the comments below ...
