, The Register 2005-04-28
Quantum cryptography - long the stuff of cyberpunk novels and hi-tech spy stories - is leaving the laboratory and making its way into commercial markets. A briefing session at the UK's Department of Trade and Industry on Wednesday featured demonstrations of working quantum key exchange systems by QinetiQ, Toshiba Cambridge and US start-up MagiQ.
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I have 2 questions regarding this subject.
1. We are lead to believe that it is impossible for these photon's to be intercepted and read, yet they are able to use 'repeaters' to transmit over long distances. wont this be an interception which will irrevocably change the nature of the photon?
2. Do you seriously believe that the paranoid nations will allow the transmission of uncrackable, secure communications? Whose knows what those darn terrorists will be using this technology to talk about.
I'm pretty sure there is a legal limit on the length of encryption key your allowed to use. Why? Because that way the various security agencies are able to crack the communications. They would be pretty miffed if anyone with a glint of world domination in their eye is free to communicate freely with accomplices without fear of 'eavesdroppers'.
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Link to this comment: http://www.securityfocus.com/comments/articles/11046/31715#31715