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

A quantum key distribution and variable technology, which is applied to key distribution, can solve the problems of inability to enlarge private keys and meet the requirements of long-distance CV-QKD systems, and achieve the effect of improving resource utilization and efficiency

Active Publication Date: 2018-01-30
PEKING UNIV +1
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Problems solved by technology

[0007] To sum up, the traditional private key amplification process is difficult to meet the requirements of

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

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Embodiment Construction

[0030] The following examples specifically illustrate the method of the present invention. The present invention is a long code private key amplification method used in continuous variable quantum key distribution, and the specific implementation scheme is as follows:

[0031] First, according to the performance of the computer, calculate the optimal single private key amplification length m and Toeplitz matrix size m×l. The specific calculation method is to test the optimal private key amplification length m and Toeplitz matrix size m×l that the computer can handle by adjusting the length of the key after error correction and the size of the Toeplitz matrix.

[0032] Then according to the length n of the key after data coordination in the CV-QKD post-processing and the estimated safe code rate length k estimated by the parameter, as well as the computer's optimal private key amplification length m and the size of the Toeplitz matrix m×l, the error-corrected Keys and Toeplitz...

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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...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70
Inventor 郭弘喻松王翔宇张一辰李政宇
Owner PEKING UNIV
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