Efficient Energy Consumption of IoT Network Security Based on Symmetric and Asymmetric Cryptography and Hash Function

The Internet of Things (IoT) is a network of connected lightweight devices. These devices with limited resources (energy, memory, processing, and storage capacity) can collect and transmit data by broadcasting over a wireless network. Therefore, it has become crucial to authenticate broadcast messages and ensure their confidentiality and integrity. However, this must be done while also considering the limitation of connected objects. In this paper, we present an effective approach for securing communication between the IoT gateway and devices using Symmetric and Asymmetric Cryptography and the Hash Function (SACHF). The combination of both Symmetric and Asymmetric cryptography ensures confidentiality and reduces encryption power consumption compared to using asymmetric cryptography alone. The hash function allows us to verify the authenticity and maintain the integrity of data exchanged in an IoT network. To validate our hypothesis, we realized several simulations on resource-constrained IoT motes using the Contiki Cooja simulator. Results demonstrate that our solution ensures the security objectives with a reasonable increase in energy consumption.