Abstract
With opportunities brought by Internet of Things (IoT), it is quite a challenge to assure privacy preservation when a huge number of resource-constrained distributed devices is involved. Blockchain has become popular for its benefits, including decentralization, persistence, immutability, auditability and consensus. With the implementation of blockchain in IoT, the benefits provided by blockchain can be derived in order to make IoT more efficient and maintain trust. In this paper, we discuss some applications of IoT in different fields and privacy-related issues faced by IoT in resource-constrained devices. We discuss some applications of blockchain in vast majority of areas, and the opportunities it brings to resolve IoT privacy limitations. We, then, survey different researches based on the implementation of blockchain in IoT. The goal of this paper is to survey recent researches based on the implementation of blockchain in IoT for privacy preservation. After analyzing the recent solutions, we see that the blockchain is an optimal way for preventing identity disclosure, monitoring, and providing tracking in IoT.
Highlights
With the recent advancements in the field of Information Technology, a complex system called Internet of Things (IoT) evolved
A blockchain-based architecture for IoT privacy preservation is proposed by Rahulamathavan et al [117], in which an attribute-based encryption has been used with Testbed platform to achieve data privacy and confidentiality, but there is a slight time increase due to involvement of multiple attribute authorities and using PoW consensus mechanism
Despite of all the opportunities that IoT brings, it suffers from issues like heterogeneity of IoT devices, resource constraints, and poor interoperability between these devices
Summary
With the recent advancements in the field of Information Technology, a complex system called IoT evolved. At different layers of IoT, privacy mechanisms and issues are analyzed While there are a huge number of surveys that discuss the security parameters, such as integrity, non-repudiation, transparency and immutability, provided by blockchain to IoT, this survey focuses mainly on privacy preservation in resource-constrained IoT devices using blockchain. In this survey, we present state-of-the-art literature on privacy preservation assurance in IoT using blockchain. Today IoT is not just limited to the personal use, but it is being used to detect weather, monitor surgeries, manage energy, monitor environment and manage transportation
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