In this paper we investigating on Personal health record (PHR),which is a patient-centric model of health information exchange, and is stored at a third party i.e., cloud providers. But there are concerns such as personal health information can be exposed to third party servers and to unauthorized parties. In order to assure the patients’ authority over approach to their personal PHRs, it is an assuring method to encrypt the PHRs before outsourcing. These are issues like elastic access, reliability in key management; privacy exposure and efficient user revocation have continued to be the most significant dispute towards accomplishing fine-grained, cryptographically imposed data access control. Sequentially to have control for data access to PHRs stored in semi trusted severs, a novel patient-centric structure and a suite of methods is proposed in this paper. We leverage attribute-based encryption (ABE) practices to attain scalable and fine grained data access control for personal health records to encrypt each patient’s PHR file. In this paper, we concentrate on the several data owner situation, which is different from earlier works in secure data outsourcing. It divides the users in the PHR system into several security domains which decreases the key management complexity for owners and users. Simultaneously, patient confidentiality is maintained and guaranteed by exploiting multiauthority ABE.

R.Srinivas,Ajay Kumar."Attribute-Based Encryption for Reliable and Secure Sharing of PHR in Cloud Computing". International Journal of Computer Engineering In Research Trends (IJCERT) ,ISSN:2349-7084 ,Vol.2, Issue 10,pp.679-982, OCTOBER - 2015, URL :https://ijcert.org/ems/ijcert_papers/V2I1005.pdf,

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