Method for carrying out parameter estimation and key extraction through utilization of all data
A technology of parameter estimation and key extraction, which is applied to key distribution, can solve the problems of low data utilization, consumption, and low precision, and achieve the effects of improving utilization, accurate system security code rate, and accurate results
Inactive Publication Date: 2018-06-22
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
In order to meet this requirement and accurately estimate the security code rate of the system, the traditional method needs to consume about half of the original data, and can only use the remaining data to extract the key
This method not only has a low data utilization rate, but also uses only part of the original data for parameter estimation, and its accuracy is not high.
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[0021] The specific implementation of the method will be described in detail below in conjunction with the accompanying drawings.
[0022] Firstly, the legal communication parties use the synchronization data and phase compensation data of the continuous variable quantum key distribution system to roughly estimate the channel parameters, including channel transmission rate and noise variance, etc., and then calculate the signal-to-noise ratio. Assuming that the original data of both parties are x and y, and the noise is z, the following relationship is satisfied:
[0023] y=tx+z (1)
[0024] Where t is a parameter related to the channel transmission rate; x~N(0,V A ), V A is the modulation variance at the sending end; z~N(0,σ 2 ), σ 2 is noise variance; y~N(0,V A +σ 2 ). t and σ 2 The estimation method of is as follows:
[0025]
[0026]
[0027] x and y in the above formula are the synchronous data and phase compensation data of the system. Calculate the signa...
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The invention provides a method for carrying out parameter estimation and key extraction through utilization of all data. The method specifically comprises the following steps of S1, roughly estimating a channel transmission rate and a noise variance of a quantum channel through utilization of data such as synchronous data and phase compensation data of a continuous-variable quantum key distribution system; S2, carrying out multidimensional negotiation by two parties, selecting an error correction code of a corresponding bit rate for decoding according to a result of the last step, restoring original data of a non-negotiation party by a negotiation party through reversed multidimensional negotiation if the decoding is successful, and opening the group of original data if the decoding is unsuccessful; and S3, carrying out parameter estimation by the negotiation party through utilization of all original data, thereby obtaining a relatively precise secure bit rate. According to the methodprovided by the invention, the key extraction and the parameter estimation are carried out through utilization of all original data, the parameter estimation precision is greatly improved, a data utilization rate is improved, and the relatively precise secure bit rate is obtained.
Description
technical field [0001] The invention relates to the technical field of a continuous variable quantum key distribution system, and is mainly applied to a method for key extraction and parameter estimation using all original data in the post-processing of the continuous variable quantum key distribution system. This method can greatly improve the utilization rate of data, can improve the precision of parameter estimation, and can obtain a more accurate system security code rate. Background technique [0002] In today's society, information security is particularly important, it can ensure the safe transmission of information. Among them, cryptography plays a very important role. Although the development of computer technology, especially the prototype of the quantum computer has made a major breakthrough, the classical cryptography based on the complexity of mathematical calculations has been severely challenged. The advantages of quantum cryptography with unconditional secu...
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IPC IPC(8): H04L9/08
CPCH04L9/0819H04L9/0852H04L9/0858
Inventor 张一辰王翔宇喻松郭弘
Owner BEIJING UNIV OF POSTS & TELECOMM