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Measurement-Device Independency Analysis of Continuous-Variable Quantum Digital Signature.
Tao Shang1,2, Ke Li2, Jianwei Liu1,2
1School of Cyber Science and Technology, Beihang University, Beijing 100083, China.
Entropy (Basel, Switzerland)
|December 3, 2020
Summary
This study analyzes measurement-device independency in continuous-variable quantum digital signatures, particularly homomorphic ones. The research confirms the protocol
Area of Science:
- Quantum Cryptography
- Information Security
Background:
- Measurement-device loopholes pose security risks in continuous-variable quantum cryptography.
- Existing research on measurement-device independency is limited, especially for quantum digital signature protocols.
Purpose of the Study:
- To analyze the measurement-device independency of continuous-variable quantum digital signatures, with a focus on continuous-variable quantum homomorphic signatures.
- To establish a method for assessing measurement-device independency in quantum cryptographic protocols.
Main Methods:
- Calculating the upper bound of the error rate for the protocol under untrusted measurement devices.
- Simplifying calculations using the characteristics of continuous variables.
- Proving measurement-device independency based on the calculated error rate.
Main Results:
- The study establishes a method to determine if a quantum cryptographic protocol is measurement-device-independent.
- The continuous-variable quantum homomorphic signature protocol is proven to be measurement-device-independent.
- The analysis method is applicable to other quantum cryptographic protocols.
Conclusions:
- Continuous-variable quantum homomorphic signatures can achieve measurement-device independency.
- The developed analysis framework enhances the security understanding of quantum cryptographic protocols.
- This work contributes to the practical implementation of secure quantum communication systems.
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