A Study Of Group Key Extraction Based On Received Signal Strength In Wireless Sensor Network

Wireless sensor networks is one of the frontiers in current information technology, in which the security problems is of great concern. With the development of wireless sensor network technology, WSNs have increasingly extensive applications in military, environment and many other fields. However, restricted by limited hardware resources of wireless sensor devices, security solutions for traditional wireless network cannot be applied directly to ensure the security of communication. Currently, some key management schemes have been proposed in sensor networks, but dynamic key generation scheme among multiple nodes to provide the availability of group communication security is still in the research stage.In this paper, by analyzing and utilizing the proposed key agreement protocol for pairwise nodes in wireless sensor networks, we extend it to meet the communication security requirements in the group key agreement, and design a new group key agreement protocol for wireless sensor networks. This protocol uses reciprocal physical information in wireless channels as randomness source, generating group key based on the benchmark of the physical information of a particular pair of nodes in a group. The whole protocol is divided into the generation of benchmark node pair and the key generation between the benchmark node and the other group node. Our protocol can be run in a static environment, and does not require an additional infrastructure in the network. This paper also analyzes the security of the protocol and tests the practical operation of this protocol in different real-world scenes according to the steps of key generation. Finally, we give an analysis of the key generation success rate with different protocol parameters in the experimental results in this paper, and tests randomness of the generated key to verify its safety.