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.
The network connects six locations across Vienna and in the nearby
town of St Poelten, using 200 km of standard commercial fibre optic
cables.
Quantum cryptography is completely different from the kinds of security schemes used on computer networks today.
These are typically based on complex mathematical procedures
which are extremely hard for outsiders to crack but not impossible
given sufficient computing resources or time.
But quantum systems use the laws of quantum theory, which have been shown to be inherently unbreakable.
http://news.bbc.co.uk/2/hi/science/nature/7661311.stm
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