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Key management for wireless sensor networks has been a challenging research topic since stringent resource constraints make the key pre-distribution schemes difficult to implement. This paper proposes a novel key pre-distribution method based on trivariate symmetry polynomial and hash function. First, the base station assigns some random numbers to each node using BIBD, then two nodes calculate the...
Fully homomorphic encryption scheme over the integers uses integer modular arithmetic and is conceptually simple. However, its efficiency is low and the re-encryption process is complex. According to the depth analysis of the somewhat homomorphic encryption scheme, we propose a re-encryption optimization scheme over the given arbitrary function, which designs a depth threshold value and do function...
Key management poses a main concern for security operation in wireless sensor networks. Most existing key management schemes try to establish shared keys for all pairs of neighbor sensors in homogeneous sensor networks. In recent, some research has demonstrated that heterogeneous sensor networks can achieve better performance in security than homogeneous networks. In this paper we propose a key- chain...
In this paper, we study the asymptotic tracking and disturbance rejection problem for a class of uncertain nonlinear lower triangular systems subject to an uncertain exosystem. The same problem was studied before for the same class of systems with the objective of asymptotic tracking only. By utilizing a newly developed robust adaptive controller design approach, we are able to simultaneously handle...
This paper studies the global robust output regulation problem for a class of output feedback systems subject to an uncertain exosystem by using output feedback control. An adaptive control technique is used to handle the unknown parameter vector in the exosystem. It is shown that this unknown parameter vector can be exactly estimated asymptotically if the controller incorporates a minimal internal...
This paper studies the global regulation problem for a class of nonlinear polynomial systems subject to both dynamic uncertainty and static uncertainty. The dynamic uncertainty does not vanish at the origin of the state space and thus is not input-to-state stable (ISS). As a result, the small gain theory based robust control technique alone cannot handle this problem. We manage to integrate both robust...
This paper presents the solution of the global robust output regulation problem for a class of nonlinear systems with relative degree one without knowing the control direction. The result is also applied to an asymptotic tracking problem associated with the well known Lorenz system.
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