Cascade decoding method suitable for CV-QKD system data post-processing

Abstract

The invention relates to the field of communication security. The invention discloses a cascade decoding method suitable for CV-QKD system data post-processing. The method comprises: by using a mode of combining long-code-length coding and medium-short-code-length coding, firstly performing error correction by using long-code-length coding so that the number of errors can be quickly reduced to a preset threshold value within a small number of iterations; then reducing the length of the error correction code, regrouping all bits, verifying the code words of the groups of the receiving party andthe transmitting party based on a verification function, performing error correction on the code word groups with inconsistent verification results by adopting medium-short code length coding, and finally correcting all errors to finish decoding. According to the method, the advantages of coding technologies with different code lengths are fully combined, and the error correction rate is increased while the error correction success rate is ensured, so that the overall performance of a CV-QKD system is ensured.

Description

technical field [0001] The invention relates to the technical field of communication security, in particular to a cascade decoding method suitable for data post-processing of a CV-QKD system. Background technique [0002] With the development of quantum computing technology, classical cryptosystems based on computational complexity face major security risks. Quantum Key Distribution (Quantum Key Distribution, QKD) is a key distribution system based on the principle of quantum physics, which has unconditional security and has attracted extensive attention and research. Continuous Variable Quantum Key Distribution (CV-QKD) uses the orthogonal component of the light field as the carrier of information. Most devices are common to classical coherent optical communication, and have good compatibility with traditional optical communication networks. Prospects. The current CV-QKD system is mainly implemented based on the GG02 protocol, that is, the Gaussian modulation coherent sta...

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Problems solved by technology

[0015] In the current CV-QKD system data post-processing, the number of iterations caused by a small number of errors in the iterative process when using polygonal LDPC codes for error correction increases significantly, and the problem of error correction and decoding failure within the specified number of iterations, this paper The invention proposes a cascaded decoding method suitable for CV-QKD system data post-processing. Compared with the existing schemes that simply use polygonal LDPC codes to decode and correct errors, the cascaded decoding scheme proposed by the present invention is sufficient Combining the advantages of different code length coding techniques, first use long code length coding to correct most of the errors in a small number of iterations, then reduce the length of error correction coding, and use a more appropriate code word grouping for still errors Medium and short code length codes for error correction, thereby ensuring the success rate of error correction and improving the error correction rate

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