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Improving security of the ping-pong protocol. (English) Zbl 1277.94045

Summary: A security layer for the asymptotically secure ping-pong protocol is proposed and analyzed in the paper. The operation of the improvement exploits inevitable errors introduced by the eavesdropping in the control and message modes. Its role is similar to the privacy amplification algorithms known from the quantum key distribution schemes. Messages are processed in blocks which guarantees that an eavesdropper is faced with a computationally infeasible problem as long as the system parameters are within reasonable limits. The introduced additional information preprocessing does not require quantum memory registers and confidential communication is possible without prior key agreement or some shared secret.

MSC:

94A60 Cryptography
81P94 Quantum cryptography (quantum-theoretic aspects)
94A62 Authentication, digital signatures and secret sharing
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