A Dynamic Quantization Method for Symmetric Key Generation and Distribution Based on Wireless Channel Characteristics

Abstract

The invention relates to a wireless channel characteristic-based dynamic quantization method for symmetric key generation and distribution. The wireless channel characteristic-based dynamic quantization method for the symmetric key generation and distribution comprises steps of (1) detecting to obtain characteristic quantities of a wireless communication signal and dividing M time domain windows according to change rate sizes of the characteristic quantities; (2) selecting one characteristic quantity as quantization variables according to the relative movement accelerated speeds of two communication sides; (3) confirming quantization levels and a quantization interval according to numerical values of the quantization variables in the time windows; (4) dividing quantization intervals and marking the quantization intervals through binary numbers; (5) distinguishing the intervals in which the values are positioned according to the numerical value sizes and enabling the binary numbers of the intervals to be served as quantization results of the numerical values; (6) achieving dynamic quantization processing of the M time domain windows and outputting the quantized binary numbers to be served as initial key information. The wireless channel characteristic-based dynamic quantization method for the symmetric key generation and distribution can eliminate influences of large-scale information to the integral key matching ratio in a wireless channel and improve the characteristic information extraction efficiency and the key matching ratio.

Description

technical field [0001] The invention relates to the field of information security, in particular to a dynamic quantization method for symmetric key generation and distribution based on wireless channel characteristics, which is applicable to the symmetric key generation and distribution mechanism of the existing wireless communication system. Background technique [0002] The development of modern electronic cryptography benefits from the progress of computing technology and mathematical theory, but suffers from it. Under the current computing technology conditions, grid computing can be used to decipher many existing encryption schemes in a relatively short period of time, which poses a great threat to information security in the fields of national defense, government affairs, and commerce. In recent years, one-way compression functions such as MD5 and SHA-0, which have always been considered safe, have been proven to have security risks, which further strengthens people's ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a dynamic quantification method based on wireless channel characteristics of symmetric key generation and distribution, divide the detection time period into multiple time windows, and obtain according to the detection in each time window eigenvalue distribution, determine the quantization series and quantization interval, that is, use dynamic quantization method to eliminate the influence of large-scale information in wireless channel characteristics on the overall key matching rate, and solve the problem of low extraction efficiency of channel feature information and low key matching rate problem, providing a binary initial key with a higher amount of information for further processing of the key

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