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Quantum Cryptography: When Your Link Has to be Really, Really ... - Electronic News

Another long-recognized weakness in any system is the physical link that connects users or system nodes. Although several ways, such as a private channel or a physically secured link, exist to minimize this risk, it is More Common to use data encoded using a complex, mathematics-based approach, such as the RSA (Rivest/Shamir/Adleman) algorithm or a one-time key. Physically securing the link is often impractical and rules out wireless links; data encoding is susceptible to decoding by a determined eavesdropper. (Even the RSA algorithm may face this challenge as computers get More powerful.) And the one-time key, although absolutely secure in principle, has severe implementation problems in practice. But a technique Now in use appears to offer the security of the one-time key without its key-management problems, and you can also use it for absolutely secure key exchange. QC (quantum cryptography) uses a string of individual photons and their quantum states as the bases of a link in which physicist Werner Heisenberg's often-cited, often-misunderstood uncertainty principle defeats any eavesdropper. Although IBM corporate researcher Charles Bennett and the University of Montreal's Giles Brassard first conceived quantum cryptography in the 1980s, it took many years for the needed optical components and associated technologies - More available

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