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Abstract
Personal health record (PHR) is an rising patient-centric model of health info exchange, that is usually out sourced to be hold on within the third party, like cloud suppliers. However there are wide privacy issues as personal health info might be exposed to those third party servers and to unauthorized parties. Issues like risk of privacy exposure measurability in key management, versatile access and economical user revocation, have remained the foremost necessary challenges towards achieving fine-grained, cryptographically enforced knowledge access management. In this paper, we tend to propose a completely unique patient central framework and a collection of mechanisms for knowledge access management to PHRs hold on in semi-trusted servers. to attain fine-grained and ascendible knowledge access management for PHRs, we tend to leverage attribute-based encoding (ABE) techniques to encipher every patient's PHR file