Satellites are increasingly relied upon for military and intelligence use but securely transmitting voice, image and other communications remains troublesome.
In June, for instance, European satellite TV viewers could watch surveillance video of American military bases in Bosnia that was being broadcast in an unencrypted stream, via satellite.
Now, British military researchers have improved an emerging method of secure transmission for the encryption keys used to unscramble such data.
In a demonstration reported in this week's issue of the journal Nature, the researchers say they successfully exchanged encryption keys transmitted on a beam of invisible light.
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