Physical layer key generation preprocessing method based on symplectic transformation

Abstract

The invention discloses a physical layer key generation preprocessing method based on symplectic transformation, which comprises the following steps of: firstly, respectively acquiring uplink and downlink channel characteristic measurement values by two wireless communication parties Alice and Bob, respectively performing symplectic transformation on the acquired uplink and downlink channel characteristic measurement values, and finally obtaining a channel characteristic result on a time delay Doppler domain. The generated channel characteristics of the time delay Doppler domain can further generate a secret key through the steps of quantization, secret key negotiation, privacy methods and the like. According to the invention, the problem of low key generation consistency rate caused by poor channel reciprocity due to high-speed movement of the terminal is solved. The method is used for improving the consistency of physical layer keys and enhancing the security of a wireless communication system, can be specifically applied to wireless key distribution, including the fields of secure communication, millimeter wave communication, underwater communication, military communication and the like, and can be expanded to a multi-node communication scene.

Description

technical field [0001] The invention belongs to the field of communication security, and relates to a key generation technology in a wireless communication system, in particular to a physical layer key generation preprocessing method based on symplectic transformation. Background technique [0002] With the development of communication technology and the continuous expansion of wireless communication application scenarios, both parties in the communication have higher and higher requirements for confidentiality in the communication process. Symmetric / asymmetric encryption methods are mainly used in current wireless communication networks, and the key lies in the distribution and management of keys. The traditional key distribution and management mainly adopts the method of pre-negotiation or key exchange. However, the pre-negotiated key distribution mechanism itself has security risks, and the key security mechanism based on computational complexity is also faced with the de...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention discloses a physical layer key generation preprocessing method based on symplectic transformation, which can effectively solve the problem of poor channel reciprocity in high-speed mobile scenarios

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