A semi-quantum privacy comparison method and system based on bell state

Abstract

The invention belongs to the field of data information technology, discloses a semi-quantum privacy comparison method and system based on the Bell state, and uses the attributes of the Bell state to realize the comparison of privacy information between semi-quantum users; on the basis of ensuring the completion of the privacy comparison, the present invention It improves the qubit efficiency and simplifies the protocol process; while ensuring the completion of privacy comparison, it ensures that third-party TP and external eavesdroppers cannot obtain some or all of the user's private information. The invention enables the protocol to be applied to the current actual network environment, and promotes the practical process of quantum technology; the semi-trusted TP can complete privacy comparison and wiretapping detection through simple Bell measurement, and he cannot obtain additional private information; TP finally only needs to publish a classic particle to indicate whether the private information of both parties is equal.

Description

technical field [0001] The invention belongs to the technical field of data information, in particular to a Bell state-based semi-quantum privacy comparison method and system. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] In the context of the increasingly perfect quantum technology, my country has built a 2,000-kilometer-long Beijing-Shanghai quantum communication trunk line, the metropolitan optical fiber quantum communication technology has matured, and the quantum communication network has entered the practical application stage from the laboratory research stage. Quantum cryptography is an interdisciplinary subject that combines quantum physics and classical cryptography. It is a new type of cryptographic system that uses the basic characteristics of quantum physics to realize cryptographic ideas. Compared with classical cryptography, which relies on computational complexity to achieve communi...

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Problems solved by technology

However, classical users or users with only partial quantum processing capabilities cannot afford such expensive quantum equipment, which limits the scope of use of quantum privacy comparison protocols to a certain extent.

[0007] (2) The efficiency of qubits is not high: the existing quantum privacy comparison protocols usually need to add anti-eavesdropping and anti-information leakage measures at each step, which requires ingenious protocol design, and even requires a large number of qubits to assist in completing these tasks. However, there are very few private information that can be detected.

[0008] (3) The implementation of the existing quantum privacy comparison protocol is relatively complicated: the realization of privacy comparison usually requires the XOR of multiple quantum sequences to hide the user's private information

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