Blockchain-Enabled Security-Aware Applications in Home Internet of Thing

Data security and privacy protection in the Internet of Things (IoT) have attracted wide attention, especially in private scenarios, such as Home Internet of Things (HIoT). Data de-centralization and mature encryption technology based on blockchain technology provide a proper security guarantee for HIoT. However, common blockchain technology consensus algorithm consumes a lot of computing resources of devices, and it is easy to cause network congestion in LAN due to the size of each transaction and transactions' frequently spread. Just Blockchain Storage Model (JBSM) means every blockchain node in the network stores all of the transaction data that launched in the whole blockchain network, there is no doubt that JBSM consumes a lot of storage resources. In this paper, we propose a Blockchain and Centralized Storage Model (BCSM) for HIoT, which reduces the network bandwidth occupied by transaction data and increases the speed of transaction verification by reducing the size of transaction data. The model consists of three parts: HIoT, Blockchain Network and Cloud Storage Server. This paper analyses how BCSM improves transaction efficiency. Finally, through the simulation experiment on Tencent BaaS, the model is compared with the JBSM, which shows the method in this paper not only has the data security characteristic endowed by the blockchain but also improves the transaction efficiency to a certain extent.