Embedding Blockchain Technology into IoT for Security A Survey

Abstract : In recent years, the Internet of Things (IoT) has made great progress. The interconnection between IoT and the Internet enables real-time information processing and transaction implementation through heterogeneous intelligent devices. But the security, the privacy, and the reliability of IoT are key challenges that limit its development. The features of the blockchain, such as decentralization, consensus mechanism, data encryption, and smart contracts, are suitable for building distributed IoT systems to prevent potential attacks and to reduce transaction costs. As a decentralized and transparent database platform, blockchain has the potential to raise the performance of IoT security to a higher level. This article systematically analyzes state of the art of IoT security based on the blockchain, paying special attention to the security features, issues, technologies, approaches, and related scenarios in blockchain-embedded IoT. The integration and interoperation of blockchain and IoT is an important and foreseeable development in the computational communication system.
 EXISTING SYSTEM :
 ? The IoT produces countless digitized services and applications that provide several benefits over existing solutions. ? Compared to the existing reviews conducted on integrating IoT with blockchain, this paper provides an up-to-date comprehensive survey of IoT with blockchain. ? The existing centralized model of the IoT system provides several advantages to connect and communicate a wide variety of devices that are managed by the centralized server. ? Blockchain technology is among the most recent themes that attracted the attention of several organizations and researchers due to the countless benefits it provided over existing solutions .
 DISADVANTAGE :
 ? The integration of blockchain and IoT can solve this problem. In particular, every part will be associated with a unique ID with the creation. ? The creation of a newly-generated block is equivalent to the solution of a computationallydifficult problem. ? This computationally-difficult problem (aka a puzzle) can nevertheless be verifiable without difficulty. ? Health care becomes one of the major social-economic problems due to the aging population while it also poses new challenges in traditional healthcare services because of the limited hospital resources.
 PROPOSED SYSTEM :
 • Their proposed solution enabled decentralization for access control, authentication and payments depending on blockchain technology. • They proposed that blockchain technology be integrated with the IoT to build an efficient identity management system to provide better trust and performance. • Blockchain was also proposed as an efficient solution to enhance the security and privacy of healthcare data. • Several researchers proposed utilizing blockchain to overcome the issues of existing systems. • Their proposed system replaced labour-intensive recording and minimized human involvement, which created a smart agriculture system.
 ADVANTAGE :
 ? This centralization manner inevitably results in the extra cost, the performance bottleneck and the single-point failure (SPF) at centralized service providers. ? In contrast, blockchain allows the transaction being validated between two peers without the authentication, jurisdiction or intervention done by the central agency, thereby reducing the service cost, mitigating the performance bottleneck, lowering the SPF risk. ? In addition to SDN and NFV, the appearance of network slicing technologies brings the agility and flexibility of networks to support different functional and performance requirements. ? Nevertheless, it can cause a performance bottleneck and a single-point-of-failure if all the nodes offload their tasks to the same MEC server.

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