%X We address the widely open problem of access control in wireless sensor networks (WSN). Namely, we apply a suitable threshold secret sharing scheme relying on advanced polynomial interpolation theory to design a distributed access control protocol exploiting the natural hierarchical structure of the WSN. %D 2007 %A G. Boato %A F. G. B. De Natale %A C. Fontanari %A A. Massa %I University of Trento %L elediasc12538 %T Hierarchically Distributed Access Control Protocol for Wireless Sensor Networks