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The problem of unconditional security of quantum cryptography (i.e. thesecurity which is guaranteed by the fundamental laws of nature rather than bytechnical limitations) is one of the central points in quantum informationtheory. We propose a relativistic quantum cryptosystem and prove itsunconditional security against any eavesdropping attempts. Relativisticcausality arguments allow to demonstrate the security of the system in a simpleway. Since the proposed protocol does not employ collective measurements andquantum codes, the cryptosystem can be experimentally realized with the presentstate-of-art in fiber optics technologies. The proposed cryptosystem employsonly the individual measurements and classical codes and, in addition, the keydistribution problem allows to postpone the choice of the state encoding schemeuntil after the states are already received instead of choosing it beforesending the states into the communication channel (i.e. to employ a sort of``antedate'' coding).Comment: 9 page

The role of causality in ensuring the ultimate security of relativistic quantum cryptography