It's give us a clue GCHQ, with only hours to solve crypto-challenge

Amateur cryptographers have just a few hours to solve GCHQ's head-scratching Christmas puzzle, with the deadline for the festive challenge coming at midnight today. Robert Hannigan, director of GCHQ - one of Britain's intelligence and security agencies - released a festive card last month featuring not reindeer or Father Christmas, but a cryptographic challenge. Participants had to fill in a grid-shading puzzle to unveil a picture, which is the first in a series of increasingly complex challenges. Nearly 30,000 players have reached the final stage - about five per cent of those who started it - but none has successfully completed it, GCHQ said this week. The complete solution to all stages of the puzzle will be published on the GCHQ website in early February after all entries have been received and the competition has closed. GCHQ's website attracted huge visitor levels eager to take the challenge over the Christmas period. Nearly 600,000 people successfully completed the opening stage of the puzzle - a nonogram which when completed correctly, creates a "quick response" code which leads to the next stage of the challenge. The puzzle was designed to amuse recipients of the...

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