Wireless sensor network key management method based on key table

Abstract

The invention relates to a wireless sensor network key management method based on a key table. An N order key table matrix is generated by a random function in a networking stage in a wireless sensor network based on clustering, the order of the key table matrix is voluntarily configured by a network manager, the larger the order is, the higher the strength of the generated key is, and elements in the key table are extracted to serve as key materials to construct a pair key and a group key for node communication, wherein the key table limits the elements in the matrix by modular operation, and the diversity of the generated keys is improved; and the pair key and the group key are updated in a network operation stage. The method specifically comprises the following steps: 1, establishing a pair key material; 2, establishing the pair key; 3, establishing and allocating the group key; 4, updating the pair key; and 5, updating the group key. By adopting the method, the strength of the generated keys is improved, the calculation, storages and communication overheads of the nodes can be reduced, meanwhile the forward/backward safety of the network is guaranteed, and the ability of defending replay attack, forgery attack and other common network attacks are available.

Description

Technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a key management method for wireless sensor networks based on a key table. Background technique [0002] A wireless sensor network (Wireless Sensor Network, WSN) is composed of a large number of small and low-cost wireless sensor nodes. This network is a typical distributed mobile network and can be used in many different application scenarios such as military and medical. Because of the limited hardware characteristics of wireless sensor networks, more and more researches are focused on the security of WSN, and are dedicated to developing a security solution with high network security and low computing overhead for sensor nodes. As an important means of network security, key management often plays an important role in the process of information encryption and authentication. Research on key management schemes suitable for WSN will promote the development of WSN and pav...

AI Technical Summary

Problems solved by technology

[0004] Existing key management schemes based on wireless sensor networks focus on a single construction method for key or group key, and lack a complete key management system solution integrating key pair and group key

At the same time, the existing schemes are deficient in the key strength, even if there is a high key strength, it cannot guarantee the balance of the relationship between it and the calculation overhead and communication overhead

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