Quantum cryptography is secure against intruders, since you can't intercept data in mid-flight without ruining it. The technology won't always stop leaks, however, which is why the University of Cambridge has developed a new protocol that keeps participants honest. The method combines the theories of both quantum physics and special relativity to preserve data in a locked state that isn't readable unless the sender provides a key; the laws of physics prevent anyone from decrypting the info beforehand. While we won't see any practical application of this quantum lock for a while, it could prove vital to financial traders and others who can't always trust their contacts.
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