Position-Based Cryptography with Quantum and Classical Schemes Using Multiple-Valued Logic Computing

It is proposed that the quantum protocol of D. Unruh be combined with a random oracle scheme based on multiple-valued functions with randomly chosen parameters to verify the visits of a mobile agent to route checkpoints. This approach cannot provide unconditional security but gives an opportunity to improve the relative level of security for position-based cryptography schemes in which an eavesdropper exploits false signals.