Abstract
This paper advocates a secure sensor node for IoT-enabled traffic light system. The node is composed of a magnetoresistive sensor, a microcontroller, and a communication module. The sensor node communicates with the traffic light controller using the Zigbee protocol. The system can also count the number of the vehicle to determine the level of service. The sensor node uses an elliptic curve digital signature algorithm for secure communication with the traffic light controller. The implementation results show that the system has a latency of less than 1.4 sec and resilient to side-channel attack using the secp160r1 curve parameters. The system consumes on average 148 mW at 3.3V.