A method for enhancing the reciprocity of physical layer information

Abstract

The invention provides a method for enhancing the reciprocity of physical layer information. First of all, modify the communication protocol of the two parties so that it can quickly build and return the detection frame at the link layer, which reduces the time difference between the two parties measuring the channel, thereby reducing the channel change during this period of time, and improving the extraction efficiency of the two parties. The reciprocity of the channel characteristics obtained; then, according to the variance of the extracted channel characteristics, dynamically adjust the sending rate of the detection packet, which reduces the channel and system overhead, and enhances the reciprocity of the communication parties; then, screens out the dynamic The channel characteristics measured in the area; finally, the channel characteristics with enhanced reciprocity can be obtained by denoising the selected channel characteristics.

Description

technical field [0001] The invention belongs to the technical field of communication security, and in particular relates to a method for enhancing the reciprocity of physical layer information. Background technique [0002] With the simultaneous development of technology and society, wireless communication has become the main way for people to interact. However, the traditional encryption system is no longer applicable in wireless communication. In order to solve the problems of difficult key distribution and long update period, a key generation technology based on physical layer information has been developed. How to increase the key generation rate and ensure the high randomness of the key is the key problem to be solved by the key generation technology of the physical layer, and the main way to solve these problems is to ensure that the communication parties measure the channel characteristics with high correlation. However, in the process of channel feature extraction, ...

AI Technical Summary

Problems solved by technology

However, in the process of channel feature extraction, we are faced with the following problems: (1) There is a time difference between the two parties in communication when extracting channel features, and the changes in the wireless channel within this time difference will cause the channel features extracted by both parties to communicate to a certain extent. The difference in the above causes the matching rate of the initial bit string generated in the quantization phase of the communication parties to decrease, which in turn increases the overhead of the negotiation phase, resulting in a decrease in the key generation rate and the key consistency rate; (2) when the two parties in the communication generate the key, the environment Generally, it can be divided into static environment and dynamic environment. In static environment, the channel state changes slowly, and the communication parties can easily generate a key with a large number of continuous 0 or 1 bit strings, and because a large number of channel characteristics are near the quantization threshold, both parties quantify The consistency rate of the generated initial bit string is relatively low; the channel characteristics of the dynamic environment change drastically, and the communication parties can generate keys with high accuracy and high randomness at a high rate; however, in a key generation, there will often be There is a situation where the static environment and the dynamic environment interact, and the key generated in the static environment will have a certain degree of impact on the quality of the key; (3) Due to the differences in the manufacturing process of electronic components, the hardware of the same type of equipment There are differences in parameters, which will affect the signal it receives and sends. At the same time, due to the influence of environmental noise, there will be differences in the channel characteristics extracted by the two parties at the same time.

However, because it transmits the channel characteristics measured by each other in the open channel, it is easy to be eavesdropped by a third party to obtain the key information

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