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Both blockchain and disseminated registering are expecting a basic part in changing endeavors’ work environments and the way standard handling works. Their rise has not quite recently gained energy in the current business establishment yet has furthermore changed the way the universe of usage headway, storing, online trade, and various organizations limits. Regardless, challenges suffer in the wide execution of blockchain in cloud. This book area plans to introduce the impact of blockchain on cloud and how to diminish.

Blockchain provides privacy and security without centralized authority. This work analyzes cryptography applications in blockchain and analyzes efficient sharing of health records using Attribute-Based Encryption (ABE). Secure data sharing of sensitive information stored in cloud is very important as anybody can access it from anywhere in the world. This work aims to provide a secure sharing of medical records in cloud using enhanced Ciphertext Policy (CP-ABE) and Key Policy (KP-ABE) techniques along with data owner specifying the access control policies. In an open-networked system, machine learning algorithms are effectively used in pharmacovigilance to find the Adverse Drug Reaction (ADR). Securing this sensitive data in cloud is very important as PHRs privacy concern is very important.