All proxy scheme for event source anonymity in wireless sensor networks

Event source anonymity is potentially an important aspect of secure wireless sensor networks (WSN). The existing schemes developed for wired networks do not work in WSNs due to the characteristics of radio transmission and limited resources. A recent article proposed several solutions for the strong global adversary model. The protocols depend on dummy messages and special proxy nodes that filter out unnecessary messages. We present an improved scheme - the All Proxy Scheme - that improves the efficiency by performing message filtering at every sensor node. Our simulations show that APS improves real message delivery ratio and decreases message overhead while maintaining the same security guarantees as PFS and TFS described in.