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Key exchange
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=== Quantum key exchange === {{main | quantum key distribution }} [[Quantum key distribution]] exploits certain properties of quantum physics to ensure its security. It relies on the fact that observations (or [[Measurement in quantum mechanics|measurements]]) of a quantum state introduces perturbations in that state. Over many systems, these perturbations are detectable as noise by the receiver, making it possible to detect [[Man-in-the-middle attack|man-in-the-middle attacks]]. Beside the [[Correctness (computer science)|correctness]] and [[Completeness (logic)|completeness]] of quantum mechanics, the protocol assumes the availability of an [[Message authentication|authenticated channel]] between Alice and Bob.
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