CODEBREAKERS at GCHQ have published their toughest ever puzzle to celebrate WW2 hero Alan Turing appearing on the new £50 note.
The clever boffins behind the fiendish quiz claim it could take SEVEN hours to crack and "might even have left Mr Turing scratching his head". The quiz from GCHQ is below, and you can also .
The difficult puzzles are based on the unique design elements of the new plastic banknote, such as the technical drawings for the British Bombe - the machine designed to break Enigma messages.
Once cracked and converted into decimal figures, the numbers reveal a significant date in modern cyber espionage.
Turing was one of the Bletchley Park boffins who cracked the Nazis' Enigma machine, which helped Britain win the war.
But the mega-brain mathematician, played by Benedict Cumberbatch in The Imitation Game, was persecuted for being gay.
Turing took his own life in 1954 after being convicted of gross indecency and forced to undergo chemical castration.
GCHQ chief Jeremy Fleming hailed Turing's appearance on the new £50 note as a “landmark moment in our history”.
GCHQ have not published the answers yet - because they want to know if anyone solves it on their own.
Anyone who cracks the first 11 puzzle can plug their answers into puzzle number 12, on the GCHQ website.
If the answer is correct they may even get hired.
The note, which features codes and quotes from Turing, the father of modern computers, will enter circulation on Turing's birthday in June.
“Not only is it a celebration of his scientific genius which helped to shorten the war and influence the technology we still use today, it also confirms his status as one of the most iconic LGBT+ figures in the world,” Fleming said.
“Turing was embraced for his brilliance and persecuted for being gay. His legacy is a reminder of the value of embracing all aspects of diversity, but also the work we still need to do to become truly inclusive,” Fleming added.
Turing is often hailed as Britain's greatest puzzler, but wrote a letter in 1937 in saying: "I am not much use at them"
The spooks have based on the banknote’s design.
They said even “experienced puzzlers” will take around seven hours to complete the sequence, known as the Turing Challenge.
Mr Turing's great-nephew, James Turing, described the puzzle as a "wonderful tribute" which his family would be attempting to complete themselves.
A GCHQ codebreaker, who onle gave his name as Colin, a said: “Alan Turing has inspired many recruits over the years to join GCHQ.
“So it seemed only fitting to gather a mix of minds from across our missions to devise a seriously tough puzzle to honour his commemoration on the new fifty pound note.
"It might even have left him scratching his head – although we very much doubt it!”
The spooks, based in Cheltenham, also published puzzles on Christmas cards to other intelligence agencies around the world.
The Bank of England picked Turing from almost 230,000 nominations.
Speaking in 2019, then governor Mark Carney said: "Alan Turing was an outstanding mathematician whose work has had an enormous impact on how we live today.
"Turing is a giant on whose shoulders so many now stand.”
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