Wireless body area network symmetric key negotiation method

Abstract

The invention discloses a wireless body area network symmetric key negotiation method. A promise is initiated to a node B by a node A. The wireless body area network symmetric key negotiation method is characterized by comprising the steps that: the node A acquires a physiological signal at a tp moment, the physiological signal is set as w; then a sharing secret key is generated according to the w, data is transmitted to the node B in a hidden manner; the node B extracts a physiological signal at the same moment, the physiological signal is denoised and the value of the physiological signal is verified whether to be correct; if the value of the physiological signal is correct, a negotiation secret key is solved; and if the value of the physiological signal is wrong, the physiological signal is obtained near the moment w, and the secret key is continuously solved. According to the wireless body area network symmetric key negotiation method, the requirement of accurate synchronization for time is avoided, the problem of high energy consumption of frequent broadcasting of synchronous signals is solved; and in a process of secret key negotiation, most of nodes are used for processing data without transmitting the data, thus the energy consumption in the process of secret key negotiation is effectively reduced. According to the wireless body area network symmetric key negotiation method, the negotiation is unconcerned with the entropy of the signal, a weak time synchronization method and a secret key presetting technology are adopted, and a better attack preventing property is achieved.

Description

technical field [0001] The present invention relates to a wireless body area network symmetric key agreement method, more specifically, to a wireless body area network symmetric key agreement method based on weak time synchronization and denoising processing. Background technique [0002] The wireless body area network is a kind of miniature wireless sensor network formed on the human body by the medical sensor nodes deployed on the surface and body of the human body through mutual communication, which can be used to collect physiological signals of the human body (such as pulse, blood pressure, blood oxygen, etc.) , body temperature, etc.), monitor the posture of the human body (such as walking, running, standing up, squatting). The wireless body area network can not only transmit the collected human physiological signals to the telemedicine center, but also use these physiological signals to realize intelligent treatment (such as precise drug injection) on the human body....

AI Technical Summary

Problems solved by technology

However, although this method avoids the high energy consumption brought by interactive key agreement and has the advantage of low energy consumption, there are still two major defects in this technology: (1) It cannot solve the time synchronization under the precise time synchronization mechanism High energy consumption caused by frequent broadcasting of signals; (2) only high-entropy physiological information can be used for key negotiation; (3) symmetric keys can only be selected from error-correcting codes, which has great limitations

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