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Submission + - GCHQ Challenge solution explained (blogspot.com)

Submitted by
DrDevil
DrDevil writes: ""The British spy agency GCHQ recently published a puzzle on www.canyoucrackit.co.uk (as featured on slashdot), now just a few days later an academic at the University of Greenwich in England has posted a full video explanation of the puzzle. The puzzle has three stages and is not at all simple — likely to challenge even the best computer science graduates.

Solution and explanation at http://gchqchallenge.blogspot.com/""

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