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GCHQ reveals answers and winners of Christmas puzzle
Speed Read More than 600,000 tried to complete five-round challenge – but only three men triumphed
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The world's hardest games and puzzles: solutions and clues
In Depth Spoilers ahead: answers and hints for some of the internet's most taxing conundrums
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The world's hardest games and puzzles: from GCHQ to Einstein's riddle
Speed Read Six infuriatingly complex puzzles that are unsolvable to all but the sharpest of minds
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GCHQ to recruit 'hipster spies' via graffiti campaign
Speed Read Intelligence agency has been spraying graffiti around trendy east London to attract budding spooks
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MI5 told to recruit more middle-aged mums
Speed Read Women are more 'intuitive' says intelligence report, but Ukip MEP says women should 'stick to changing nappies'
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US and British spies 'hacked world's largest sim card maker'
Speed Read Hack gave GCHQ and NSA access to billions of calls and mobile data, according to new Snowden leak
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GCHQ unlawfully spied on UK citizens through NSA
Speed Read Investigatory Powers Tribunal says GCHQ was not sufficiently transparent with the public
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UK and US stage joint 'cyber war games'
Speed Read Exercises will begin with a simulated attack on the financial sector to test both countries' response to online crime
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Is the West now at war with Russia without realising it?
In Depth A cyber attack on America’s largest bank, JP Morgan, raises questions only Vladimir Putin can answer
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Drones being used 'to harass people and commit crime'
Speed Read Police warn that unmanned drones are already being used for 'nefarious purposes'
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Google and Facebook ‘aiding terrorists,’ says new GCHQ chief
Speed Read The big tech companies must work with governments to stop terrorists, says head of UK spy agency
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GCHQ admits that it views data without a warrant
Speed Read Document shows that British spies can access NSA data without a warrant, contrary to government claims
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Spies 'undermining' efforts to monitor dark web
Speed Read While some at GCHQ and the NSA try to crack encrypted networks, others may be undoing their work
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NSA spies capturing data from 'leaky' apps like Angry Birds
Speed Read Latest Edward Snowden leaks reveal iPhone and Android apps are rich source of data for agencies
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