Securing communication between things using blockchain technology based on authentication and SHA-256 to improving scalability in large-scale IoT

The IoT ecosystem allows communication between billions of devices worldwide that are collecting data autonomously. The vast amount of data generated by these devices must be controlled totally securely. The centralized solutions are not capable of responding to these concerns due to security challenges and scalability problems. Thus, blockchain technology is an effective solution, and the "distributed" method has been employed to overcome these concerns to allow for entirely secure communication between devices. The present paper proposes a technique consisting of two steps. The first step deals with the authentication of each node using the identity-based signature to secure communication between devices on a blockchain platform. In the second step, blocks are sent by hashing. For this purpose, the identities of the devices have been used as public keys. The theory analysis and simulation results indicated the superiority of the proposed method in terms of average detection rate, throughput, scalability, time spent on block authentication, and consumption energy compared to S-LoRaWAN and DLBA-IoT. Also, the simulation results show how the proposed approach can significantly increase the security of each thing and network security.