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

Abstract

The invention belongs to the technical field of data information, and discloses a semi-quantum privacy comparison method and system based on a Bell state, and the method comprises the steps: achievingthe comparison of privacy information between semi-quantum users through the attributes of a Bell state; On the basis of ensuring completion of privacy comparison, the quantum bit efficiency is improved, and the protocol process is simplified; And it is ensured that the third-party TP and the external eavesdropper cannot obtain part or even all of privacy information of the user while it is ensured that privacy comparison is completed. According to the invention, the protocol can be applied to the current actual network environment, and the practical process of the quantum technology is promoted; Privacy comparison and eavesdropping detection can be completed by the semi-trusted TP through simple Bell measurement, and additional privacy information cannot be acquired by the semi-trusted TP; And at last, the TP only needs to publish one classical particle to represent whether the privacy information of the two parties is equal or not.

Description

technical field [0001] The invention belongs to the technical field of quantum security communication, and in particular relates 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 relying on computational complexit...

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Problems solved by technology

However, users cannot afford such expensive quantum devices, 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 is very little 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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