Management method of hierarchical tree key in wireless sensor network (WSN)

Abstract

The invention provides a management method of a hierarchical tree key in a wireless sensor network (WSN). The method comprises the steps of: before distributing sensor nodes, distributing an SF (session key), a hash function used for encryption and a unique ID to each node; establishing a WSN in a clustering mode by the nodes and generating a hierarchical tree simultaneously; in the hierarchical tree, calculating a lower node key according to an upper node key; during communication, recording all IDs of the nodes passing through, calculating a key of a child node by a father node, and calculating the keys of each node by adopting the father key and the child key as communication keys and base station dynamic condition; and issuing key updating by a base station and re-calculating the keys in the tree. The nodes with different importance is differentially protected, the cost of network maintenance is reduced, the network storage content is reduced, the contradiction between the safety requirement and expandability, and short network lifetime is overcome, and the network lifetime is simultaneously prolonged under the case of ensuring the safe communication of the nodes.

Description

(1) Technical field [0001] The invention relates to a method for network key management and session key update, which can be specifically applied in a clustered wireless sensor network. (2) Background technology [0002] In wireless sensor networks, since sensor nodes are often deployed in harsh unattended environments, it is crucial to ensure secure data transmission between nodes. As a basic service that provides security functions, key management is used in the encryption and authentication of information. Therefore, finding a low-energy key management scheme to extend the life cycle of the network is the focus of current research. Because the clustered wireless sensor network can reduce the amount of data transmission and improve the network performance through the fusion of data, many key management schemes based on the clustered network have been proposed recently. In the existing clustering key management scheme, or because the nodes participate in the formation proc...

AI Technical Summary

Problems solved by technology

In the existing clustering key management scheme, or because the nodes participate in the formation process of the cluster key, the burden on the node is increased; or because the failure of the cluster head node is not resolved, the storage capacity of the node is large, etc., it cannot be widely used. application, to overcome the contradiction between the security requirements of existing technologies and the scalability and the short life cycle of the network need to be resolved urgently

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