Two Layered Wireless Security System for Highly Secured Indoor Locations

This paper proposes a smart way of handling the Electronic Voting Machine (EVM) theft problem by having a wireless network based security and monitoring system using WPAN, RF signal strength, MEMS motion sensors and GSM technology. The proposed system consists of EVM units each equipped with a MEMS motion sensor forming a WPAN network based on star topology with the coordinator node acting as the central hub of the network. The coordinator node broadcasts a beacon that enquires the status of all EVM units. Any disturbance to an EVM unit in all three dimensions can be sensed via MEMS sensors and this information will be transmitted to the coordinator unit which will send the details via SMS to respective higher authority. Radio frequency grid is an innovative way to secure a space, when an intrusion occurs, the RF propagation environment changes, and thus the received RF signal strength and Eigen values changes. The coordinator node is able to recognize this RSSI change and alert through SMS. This is an innovative method that provides low cost intrusion detection without costly cameras or video processing systems. Hence there is a two layer security providing complete protection for an entire storage room even if it contains hundreds of EVM units.