Secure Time Synchronization Scheme in IoT based on Blockchain

The era of information has arrived. As an important part of new generation of information technology, Internet of Things (IoT), which is developing rapidly, requires higher and higher time accuracy. However, the malicious nodes located in network can influence the time synchronization. The security issue of time transfer and consistency is critical and challenging. In this paper, we propose a secure scheme based on blockchain to solve the problem of time announcement in IoT. In this distributed network, a closed blockchian to record and broadcast time is utilized, which minimize attacks from external environments. Moreover, this scheme has the advantage of adapting the changes of network topology. By employing POS consensus mechanism, time synchronization can be implemented efficiently. At last, the analysis results show that this secure scheme can be achieved with high efficiency and less communication cost.