Non-coherent attack on the ping-pong protocol with completely entangled pairs of qutrits
Quantum Information Processing
Security of ping-pong protocol based on pairs of completely entangled qudits
Quantum Information Processing
Increasing the security of the ping---pong protocol by using many mutually unbiased bases
Quantum Information Processing
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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.