Efficient Quantum Private Comparison without Sharing a Key

Quantum private comparison (QPC) allows at least two users to compare the equality of their secret information, for which the security is based on the properties of quantum mechanics. To improve the use of quantum resources and the efficiency of private comparison, a new QPC protocol based on GHZ-li...

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Bibliographic Details
Published in:Entropy (Basel, Switzerland) Switzerland), 2023-11, Vol.25 (11), p.1552
Main Authors: Li, Jian, Che, Fanting, Wang, Zhuo, Fu, Anqi
Format: Article
Language:English
Subjects:
Analysis
Communication
Data encryption
decoy photon
Digital signatures
Efficiency
GHZ-like states
Investment analysis
Privacy
Protocol
Quantum cryptography
Quantum efficiency
Quantum mechanics
quantum private comparison
Safety and security measures
Third party
unitary operation
Wealth
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Summary:Quantum private comparison (QPC) allows at least two users to compare the equality of their secret information, for which the security is based on the properties of quantum mechanics. To improve the use of quantum resources and the efficiency of private comparison, a new QPC protocol based on GHZ-like states is proposed. The protocol adopts unitary operations to encode the secret information instead of performing quantum key distribution (QKD), which can reduce the amount of computation required to perform QKD and improve the utilization of quantum resources. The decoy photon technique used to detect channel eavesdropping ensures that the protocol is resistant to external attacks. The quantum efficiency of the protocol reaches 66%. Compared with many previous QPC schemes, the proposed protocol does not need to share a key and has advantages in quantum efficiency and quantum resources.
ISSN:1099-4300
1099-4300
DOI:10.3390/e25111552