Need to share a secret? A code that’s as strong as the laws of physics is within our grasp and could finally make sure your data can never leak

Closing the last loophole for unhackable quantum security

THE Romans had a saying in praise of a reliable man: “You can trust him in the dark.” But as Julius Caesar realised when several members of his inner circle stabbed him to death, sometimes the best course of action is to trust no one.

Throughout history, people have been burned by misplaced trust. Users of the extramarital affairs website Ashley Madison, whose details were leaked in August, are a good example. Their spouses are another. But as far as cybersecurity is concerned, we are finally poised to create a world in which trust is optional. The development taking us there is called device-independent quantum cryptography. Once it is perfected, you will be able to buy a secure device from your worst enemy and still be certain that no one is spying on the messages you send using it. “You don’t have to trust anyone,” says Artur Ekert …

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