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In order to speed up the propagating process, the worms need to scan many IP addresses to target vulnerable hosts. However, the distribution of IP addresses is highly nonuniform, which results in many scans wasted on invulnerable addresses. Inspired by the theory of good point set, this paper proposes a new scanning strategy, referred to as good point set scanning (GPSS), for worms. Experimental results...
With the requirement of consumer increased, many business use models have been proposed. Group Distribution as a new kind content distribution model has attracted increasing attention. It allows consumer to purchase digital content by a group and makes flexible use of rights among members possibly. However, how to use the rights belonged to group flexibly and securely has not been solved well. In...
In this paper, the numerical solution of linear systems arising from the discretization of the electric field integral equation (EFIE) in scattering problems for arbitrarily shaped targets is considered. For some geometries the associated matrix can be poorly conditioned making the use of a preconditioner mandatory to obtain convergence. Here the linear system resulting from the discretized electromagnetic...
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