Buy the gchq puzzle book uk ed by gchq isbn 9780718185541 from amazons book store everyday low prices and free delivery on eligible orders. The gchq puzzle book the perfect gift for fathers day kindle edition by gchq download it once and read it on your kindle device pc phones or tablets use features like bookmarks note taking and highlighting while reading the gchq puzzle book the perfect gift for fathers day. Gchq the uk listening and code breaking agency tweeted a cryptic message made of emoji this week the message for those who could crack it was an announcement of a new puzzle book the emoji message was a light hearted change from the serious code cracking which is gchqs specialism scroll . Gchq the uks signals intelligence and cyber security agency is giving you the opportunity to test yourself against britains leading codebreakers with the publication on thursday 20th october of its first ever puzzle book. One of the most secretive organisations in the uk the surveillance agency gchq sent out a tantalising tweet on thursdayit took the form of a colourful puzzle made up of emojis it was a tease for an announcement on friday of a new gchq puzzle book the first one in 2016 proved a surprise hit selling more than 300000 copies
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