Cryptanalysis and improvement of Wu-Cai-Wu-Zhang's quantum private comparison protocol

Abstract

In a recent paper (Int. J. Quantum Inf. 17 (2019) 1950026), the authors discussed the shortcomings in the security of a quantum private comparison protocol that we previously proposed (Int. J. Quantum Inf. 15 (2017) 1750014). They also proposed a new protocol aimed to avoid these problems. Here we analysis the information leaked in their protocol, and find that it is even less secure than our protocol in certain cases. We further propose an improved version which has the following advantages: (1) no entanglement needed, (2) quantum memory is no longer required, and (3) less information leaked. Therefore, better security and great feasibility are both achieved.

Very close to the published version

References in corpus (10)

• A large family of quantum weak coin-flipping protocols
• Remote preparation of arbitrary ensembles and quantum bit commitment
• Practical and unconditionally secure spacetime-constrained oblivious transfer
• Security bound of cheat sensitive quantum bit commitment
• One-out-of-$m$ spacetime-constrained oblivious transfer
• Flexible quantum tokens in spacetime
• Upper bounds of a class of imperfect quantum sealing protocols
• Insecurity of Quantum Bit Commitment with Secret Parameters
• Device-independent quantum private comparison protocol without a third party
• Dilemma that cannot be resolved by biased quantum coin flipping