Towards Secure Data Sharing In Internet Of Things Based On Blockchain

The impact of the Internet of Things(IoT) to our daily life has become bigger than ever,which can be witnessed from smart homes,smart transportation,and smart personal care.The mechanism of Io T including collecting information and automating certain tasks requires,among various devices,data privacy,security,seamless authentication,resistance against attacks,distributed architecture,easy deployment,and self-maintenance.Such features can be brought by blockchain,a technology underlying a cryptocurrency called Bitcoin.In this paper,we propose two schemes of integrating blockchain technology with specific scenario of Io T: IoV and UAVs system.In the first work,we present a lightweight blockchain-based fraemwork for IoV to meet the requirements of security,privacy and high availability.We propose a novel hierarchical data sharing framework where two types of sub-blockchain are formed allowing for flexible access control.In addition,we propose a reconfigured blockchain structure to acclimatize itself to the vehicular network which is composed of a number of lightweight and low-energy IoT devices.Moreover,we design a lightweight reputationbased consensus algorithm with a multi-weight reputation evaluation mechanism to prevent internal collusion of network nodes.Based on the proposed architecture,security analysis is illustrated to show the security,privacy-preserving of the proposed framework.In the second work,to secure communications during data acquisition and transmission in UAV system,as well as diminish the probability of attacking by malicious manipulated UAVs,we propose a distributed UAVs scheme harnessing blockchain technology whose network has similar topology to IoT along with the cloud server.Instead of directly using the typical blockchain technique which requires expensive computation and high bandwidth overhead,we propose a novel,secure,and lightweight blockchain architecture which mitigates the computation and storage overhead while retaining its privacy and security benefits.Moreover,multiples types of transactions are defined to describe various data access and a novel reputation-based consensus protocol is designed to ensure reliability of the decentralized network.Finally,performance evaluation demonstrates our blockchain-based distributed scheme is secure and efficient.