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‘Unbreakable’ encryption unveiled

From bbc.co.uk…

Perfect secrecy has come a step closer with the launch of the world’s first computer network protected by unbreakable quantum encryption at a scientific conference in Vienna.
[Q]uantum systems use the laws of quantum theory, which have been shown to be inherently unbreakable.
All quantum security schemes are based on the Heisenberg Uncertainty Principle, on the fact that you cannot measure quantum information without disturbing it [b]ecause of that, one can have a communications channel between two users on which it’s impossible to eavesdrop without creating a disturbance. An eavesdropper would create a mark on it.
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