Layer cluster type wireless sensor network global key management method

Abstract

The invention discloses a layer cluster type wireless sensor network global key management method, which comprises the following steps of: establishing a layer cluster type network topological structure, a session key existing between neighbor nodes, and a group key existing in intra-cluster broadcast communication; regarding a base station and all cluster head nodes as a group of nodes, enablingthe base station to receive random secret key information from each cluster head node and construct a Lagrange interpolation polynomial function based on the random secret key information, wherein each cluster head independently acquires a global secret key based on the random secret key information of the cluster head and broadcasts the global secret key to cluster members through group secret key encryption to obtain the global secret key; and enabling each cluster head to periodically generate new random key information and submit the new random key information to the base station to reconstruct a Lagrange interpolation polynomial function, thereby realizing periodic updating of the global key. According to the invention, the establishment and updating of the global key do not need thedirect participation of network nodes, the security is good, the calculation and time expenditure is small, the acquisition is convenient, the problems of frequent encryption and decryption calculation and multistage transmission in the whole network broadcast communication are solved, and the rapid and safe whole network broadcast communication is realized.

Description

technical field [0001] The invention belongs to the technical field of Internet of Things security and privacy protection, and in particular relates to a global key management method for a layer-cluster type wireless sensor network. Background technique [0002] The wireless sensor network model is simply divided into two types: plane type and layer cluster type. For networks with large network scale and node density, the layer cluster type is usually used. The layer cluster type is also the main network model for various research topics in wireless sensor networks. For the key management of layer-cluster wireless sensor networks, the research mainly focuses on the session key and group key. These two keys can basically complete the layer-cluster network without considering the efficiency of network management. Security management, but still need to consider some special situations, for example: the main communication method of wireless sensor network is broadcasting, if acc...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a layer-cluster type wireless sensor network global key management method, which solves the problems of frequent encryption and decryption calculations and multi-level transmission in the broadcast communication of the whole network

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