LITERATURE REVIEW

The research made by the author in [1] is to introduce an efficient distributed privacypreserving access control framework, in which access control models and cryptocurrency blockchain mechanisms are combined to make authorized decisions. In the proposed model, authorization tokens are considered as an access control mechanism to address cryptocurrency problems. It is making use of blockchain to ensure evaluating access policies in distributed environments, where there is no central authority and guarantee that policies will be imposed appropriately by all interacting entities. Whereas in [5], the author designed an adoptable energy management technique for smart grid network. It helps in providing the different patterns of energy consumptions without relieving the user identities.

Similarly, the author in [11] made an experiment on the relatively low level of smart home system (SHS) devices and proposed a homomorphic consortium block- chain for SHS sensitive data privacy-preserving (HCB-SDPP), based on the traditional smart home system. The features of these models are added verification services, new data structure based on homomorphic encryption. The methodology followed by the author is as follows: first, encrypt sensitive data of all gateway peers and upload them to the consortium blockchain; second, validate the security of sensitive data after homomorphic encryption processing.

A novel decentralized security model called the Lightning Network and Smart Contract (LNSC) is developed to ensure exchanges between Electrical Vehicles (EVs) and charging stations [12]. It acts as a protection safeguarding blockchain-based secure distribute/buy in plan for IoT frameworks. It empowers distributers to control information access and endorsers of get information specifically [13]. It can viably ensure information security and interests of supporters. A decentralized privacy-preserving and secure learning framework called Learning Chain uses traditional gradient descent algorithm-based machine learning systems [15].

Author Details	Year	Contribution
Ouaddah [23]	2016	An epic appropriated access control system fairness- dependent on blockchain innovation was proposed. It addresses the issues of IoT security and protection. This structure presents new sorts of exchanges that are utilized to revoke access.
Zhang [22]	2017	Proposed an E-business design for IoT, in light of the convention of the Bitcoin. Embraced disseminated self-governing enterprises as the exchange substance to manage the paid information and brilliant property.
Outchakoucht [26]	2017	Displayed the web of things worldview, and data stream in access control and security approach the executives are among the IoT gadgets. The ideas of blockchain, AI, and conveyed design are presented.
Xia[27]	2017	Proposed an access control system (ACS) for transferring sensitive information. To ensure efficient access control secure cryptographic techniques like encryption and digital signatures and permissioned blockchain are used for added security and a closely monitored system. The deployed system overcomes the traditional access control methods of passwords, firewalls, and intrusion detection systems.
Es-Samaali [29]	2017	Contributions made toward reinforcing the security of big data platforms by proposing a Blockchain-based access control framework. The concept of blockchain, mechanism and principles of the access control framework are presented with detailed explanations.

Author Details	Year	Contribution
Basha SM [33]	2017	Developed a model toward providing a recommendation system for PIMA diabetes victims in which machine learning algorithms are used in classifying the diabetes victims based on the feature like glucose and insulin levels.
Basha SM [34]	2017	Performed a deep analysis on feature selection methods in classifying the text reviews collected from twitters and suggested that 2 gram feature give better classification accuracy in predicting the sentiments
Novo [24]	2018	Designed of a new decentralized access control architecture for IoT using blockchain technology. Its objective is to operates as a single smart contract. The outcome of the proposed architecture is to simplify the whole process in the blockchain network and reduced the communication overhead between the nodes.
Esposito [25]	2018	Proposed an architecture toward facilitating data sharing among health information systems in which cloud computing technology is used to support real-time data sharing regardless of geographical locations and handling big data.
Banerjee [28]	2018	Made a systematic survey on security techniques that are designed for IoT using blockchain.
Wang [30]	2018	1. Proposed a structure that consolidates the decentralized stockpiling framework IPFS, the Ethereum blockchain, and characteristic-based encryption (ABE) innovation to accomplish finegrained access power over information in decentralized capacity frameworks. 2. The savvy contract is sent on the Ethereum blockchain to actualize the watchword search in the decentralized stockpiling frameworks. 3. The created framework is sent and tried under the Ubuntu Linux framework. A reproduction of the framework plan is helped out through the Ethereum authority test arrange Rinkeby, and the comparing execution and cost are evaluated.
Cruz[31]	2018	1. Proposed a role-based access control using smart contract (RBAC-SC), using blockchain technology and smart contracts. 2. Implemented a smart contract prototype of the RBAC-SC, deployed on the testnet blockchain of Ethereum.
Basha SM [38]	2018	Suggested that the identification of sarcasm before performing sentiment analysis is must do operation. That will help in improving the accuracy of sentiment classification.

Author Details	Year	Contribution
Basha SM [39]	2018	The aspects pair like (sentiment word, aspect word, preposition) is considered to recognize an aspect from the review. That indeed helps in performing sentiment classification at maximum accuracy.
Basha SM [35]	2018	Addressed the problems in the field of identifying the breast cancer patients. Developed an approach toward providing recommendation to the breast cancer victims.
Viriyasitavat [32]	20I9	1. Provided the basic definitions and characteristics of blockchains with respect to consensus mechanisms. 2. Identified the relations of blockchain and business process characteristics. 3. Proposed an architecture and guidelines for making consensus to be more flexible and reliable in the field of business process interoperation.
Basha SM [36]	20I9	Designed a methodology in adopting the huge number of reviews from the social networking platforms and deriving good weighted incentives that helps in optimizing the profitability of an organization.
Basha SM [37]	20I9	Making use of open source software KNIME, performed the sentiment classification on movie reviews using decision tree machine learning algorithm.

In stock, the methodology followed in all the proposed models as per the discussion is as follows: First, investigation on authentication mechanisms. Second, to propose a security model to include registration, scheduling, authentication. Third, the security model is evaluated using real-time scenario [12].