Abstract
Due to the nature of wireless transmission, communication in wireless mesh networks (WMNs) is vulnerable to many adversarial activities including eavesdropping. Pairwise key establishment is one of the fundamental issues in securing WMNs. This paper presents a new matrix based pairwise key establishment scheme. Mesh client in our scheme only needs to prestore a key seed, which can be used to generate a column of secret matrix. It can establish pairwise keys with other clients after mesh routers broadcast public matrices. Our scheme is motivated by the fact that in WMNs, mesh routers are more powerful than mesh clients, both in computation and communication. Besides, we employ the pre deployment knowledge to reduce the computational cost of mesh clients. Security and complexity analysis show that the new scheme possesses several desirable features: 1) neighbor mesh clients can directly establish pairwise keys; 2) the new scheme is updatable, scalable, and robust against node capture attacks; and 3) communication and storage costs at mesh clients are significantly reduced.
Highlights
Cyber-Physical Systems (CPS), which bridge the cyber-world of computing and communications with the physical world, are expected to change the way of interacting with and controlling the physical world around us
We propose a new matrix-based pairwise key establishment scheme to meet the need of such applications
The major contribution of this paper is a new design of pairwise key establishment for network type of CPS: WMNs
Summary
Cyber-Physical Systems (CPS), which bridge the cyber-world of computing and communications with the physical world, are expected to change the way of interacting with and controlling the physical world around us. The major contribution of this paper is a new design of pairwise key establishment for network type of CPS: WMNs. In WMNs, sensor nodes are power-constrained but mesh routers are much more powerful, both in computation and communication. RELATED WORK A widely accepted requirement of robust KPS is that an adversary, after capturing several nodes, should be difficult to derive the communication keys of other nodes or disrupt the entire networks. For this purpose, a pairwise key between two nodes is necessary. Such a mechanism provides a high level of robustness but a low level of scalability: the performance of key distribution phase will be time, computation and storage consuming when N is large, and pairwise key establishment between any current node and newly added one needs a system-wide update
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