Comparing information without leaking it
Communications of the ACM
Efficient private bidding and auctions with an oblivious third party
CCS '99 Proceedings of the 6th ACM conference on Computer and communications security
Secure multi-party quantum computation
STOC '02 Proceedings of the thiry-fourth annual ACM symposium on Theory of computing
Secure Multiparty Quantum Computation with (Only) a Strict Honest Majority
FOCS '06 Proceedings of the 47th Annual IEEE Symposium on Foundations of Computer Science
Protocols for secure computations
SFCS '82 Proceedings of the 23rd Annual Symposium on Foundations of Computer Science
How to generate and exchange secrets
SFCS '86 Proceedings of the 27th Annual Symposium on Foundations of Computer Science
A simple participant attack on the brádler-dušek protocol
Quantum Information & Computation
New quantum private comparison protocol using EPR pairs
Quantum Information Processing
Multi-user private comparison protocol using GHZ class states
Quantum Information Processing
Comment on quantum private comparison protocols with a semi-honest third party
Quantum Information Processing
Quantum Information Processing
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In this paper, protocols of quantum private comparison of equality (QPCE) are investigated. We study the security of previous QPCE protocols with a semi-honest third party (TP) from the viewpoint of secure multiparty computation and show that QPCE protocol (Chen et al. Quantum Inf Process 2012) has an obvious security flaw. A vicious inside attacker impersonating TP or the compromised TP colluding with a dishonest inside player can steal other player's secret successfully. An improved efficient and feasible QPCE protocol is proposed. In our improved scheme, only the two players can deduce the results of comparisons based on their shared key, and others will learn no information of the comparison results, even the length of secrets. The cost of communication is also be optimized. Our scheme can resist various kinds of attacks from both the outside eavesdroppers and the inside players, even the TP.