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In recent years, blockchain technology has attracted considerable attention. As blockchain is one of the revolutionary technologies that is impacting various industries in the market now with its unique features of decentralization, transparency, and incredible security. Blockchain technology can be used for anything which requires their transactions to be recorded in a secure manner. In this chapter, the authors survey the importance of the blockchain technology and the applications that are being developed on the basis of blockchain technology in area of IoT and security.

Storage as a Service is one of the functionalities of cloud computing. Storing data in cloud has its own advantages such as high availability, low costs etc., but also disadvantages like improper authentication. Features extracted from single type of biometrics of users are used to serve this purpose. Limitations of using single type of biometric systems include insecure key distribution, high computational time and memory. They are applicable only to structured data with limited data size. To overcome all these disadvantages multiple types of biometrics of users came into existence. Feature extraction, key generation, encrypting cloud data and key distribution is difficult task for many applications as the number of biometrics considered per user increased. To overcome all these limitations an efficient Siamese Network based Multi-Biometric (SNMB) model is proposed. In this work, an authentication based deep learning framework is proposed to improve the feature selection process and error rate on the different biometric feature sets also, a novel key distribution model is implemented to secure the secret of the cloud user for strong data security. Experimental results prove that proposed SNMB model has less computational time and memory. Experimental results are tested on different biometric images and the performance of the proposed SNMB model has better computation time (~6%) and less memory consumption (4%) than the conventional cloud security models.

In recent years, blockchain technology has attracted considerable attention. As blockchain is one of the revolutionary technologies that is impacting various industries in the market now with its unique features of decentralization, transparency, and incredible security. Blockchain technology can be used for anything which requires their transactions to be recorded in a secure manner. In this chapter, the authors survey the importance of the blockchain technology and the applications that are being developed on the basis of blockchain technology in area of IoT and security.

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