Cryptanalysis and improvement of the quantum private comparison protocol based on Bell entangled states

Abstract

Recently, Liu et al. [Commun. Theor. Phys. 57, 583, 2012] proposed a quantum private comparison protocol based on entanglement swapping of Bell states, which aims to securely compare the equality of two participants' information with the help of a semi-honest third party (TP). However, this study points out there is a fatal loophole in this protocol, i.e., TP can obtain all of the two participants secret inputs without being detected through making a specific Bell-basis measurement. To fix the problem, a simple solution, which uses one-time eavesdropper checking with decoy photons instead of twice eavesdropper checking with Bell states, is demonstrated. Compared with the original protocol, it also reduces the Bell states consumption and simplifies the steps in the protocol.

9 pages, 1 figure

References in corpus (6)

• Experimental quantum teleportation
• Secure quantum key distribution network with Bell states and local unitary operations
• Quantum Private Comparison: A Review
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Cited by in corpus (9)

• Multiparty Quantum Sealed-Bid Auction Using Single Photons as Message Carrier
• An Efficient and Secure Arbitrary N-Party Quantum Key Agreement Protocol Using Bell States
• Multi-party Quantum Private Comparison Protocol Based on Entanglement Swapping of Bell Entangled States
• A Novel Quantum Visual Secret Sharing Scheme
• Privacy-Preserving Quantum Two-Party Geometric Intersection
• Deterministic Joint Remote Preparation of a Four-qubit Cluster-type State via GHZ states
• Multiparty quantum key agreement protocol secure against collusion attacks
• Quantum Privacy-Preserving Price E-Negotiation
• Cryptanalysis and improvement of several quantum private comparison protocols