18.3.1. "What is quantum cryptography?" + Two main flavors: + secure channels exploiting the Uncertainty Principle + Brassard, Bennett, fiber optic lines, short distances, detects tapping + Quantum cryptography - bits can be exchanged-albeit at fairly low efficiencies-over a channel - with detection of taps, via the change of polarizations + Stephen Wiesner wrote a 1970 paper, half a decade before the P-K work, which outlined this-not published until much later - speculate that the NSA knew about this and quashed the publication + factoring of numbers using a strange Many World interpretation - Shor + hearkens to my spoof about Russians - I never knew I hit so close to the mark! 18.3.2. "What about _quantum cryptography_?" + Exploiting Uncertainty Principle to make untappable communication lines. (More precisely, tapped lines give indication of having been tapped.) - Bennett and Brassard - faint flashes of light in a fiber optic cable used; polarized photons - Alice and Bob go through a protocol that involves them picking Linear or Circular Polarization (LP or CP); can't be simultaneously measured... - - Not likely to be important for a long time. - An additional tool, or crypto primitive building block.
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