Method for amplification of long-code private key in continuous variable quantum key distribution

Abstract

The present invention provides a method for amplification of a long-code private key in continuous variable quantum key distribution. The implementation steps of the method are as follows: the step 1:calculate an optimal private key amplification length and the size of a corresponding Toeplitz matrix according to performances of a computer; the step 1: estimating an estimated safety key length according to a corrected key length and parameters, and performing blocking processing of the corrected key and the Toeplitz matrix according to the optimal private key amplification length and the sizeof the Toeplitz obtained in the step 1; and the step 3: employing the methods of Fast Fourier Transform and the Inverse Fast Fourier Transform to perform acceleration of operation between each key after blocking in the step 2 and the corresponding Toeplitz matrix, and adding the calculated results of all the blocks to obtain a final absolutely safe keys. original code length can be very large ata long distance because of limitation of a limited code length. The method provided by the invention can perform private key amplification for long codes so as to effectively utilize computing and storage resources and improve efficiency.

Description

technical field [0001] The present invention relates to the field of continuous variable quantum key distribution, and is mainly applied to the method of enlarging long code private keys in the post-processing of continuous variable quantum key distribution, and is especially suitable for considering the influence of limited code length, the initial key length is very In the long case, private key amplification can be effectively realized, so as to obtain the final security key. Background technique [0002] People pay more and more attention to information security in today's society, but the existing cryptographic systems are usually based on mathematical complexity. With the development of quantum computer technology, deciphering traditional passwords will no longer be a problem, and information security is subject to Great threat. Quantum Key Distribution (QKD) is based on physical principles, and its absolute security is guaranteed by the basic principles of quantum me...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the traditional private key amplification process is difficult to meet the requirements of long-distance CV-QKD systems, and private key amplification cannot be performed when the initial key is long

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