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An important practical application of secure sensor networks is to monitor an area that may be divided into a square grid, where the sensor devices may be placed at the points of intersection with reasonable precision. In this paper, a simulation method to analyze and design such a network is discussed. The use of simulation technique is essential to determine the robustness (in terms of connectivity and coverage) of the resulting network consequent upon the failure of a certain number of nodes, since the sensor nodes usually fail at random. Detailed design charts are constructed for the implementation of a secure sensor network using transversal designs.