Abstract
Quantum cryptography bases its security proofs on physical assumptions. A longstanding observation in the field is that we may be able to do more cryptographic tasks when we assume not only the laws of quantum mechanics but also the impossibility of superluminal signaling (i.e., that information cannot travel faster than the speed of light). Relativistic quantum cryptography takes into account the spatial locations of the parties involved and uses the impossibility of superluminal signaling as a basis for security. Previous efforts in this field have been fruitful, both theoretically and experimentally.
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