Wireless Sensor Network (WSN) is an infrastructure less that has no central administration and limited capabilities in
term of energy, power consumption, and data storage capacity. Furthermore, WSNs are key technologies for IoT. The routing
protocol is one of the most concerned areas in WSNs which is responsible for maintaining the routes in such that network. In
this paper, we aim to enhance the security of WSN routing protocol. Our contribution is modified Ad Hoc On-Demand Distance
Vector (AODV) routing protocol by building a security layer that utilizes Paillier homomorphic cryptographic mechanism;
