Enhanced Access Control for Sharing of Personal Health Record in the Cloud Computing Using Attribute Based Encryption

Personal Health Records (PHR) are often outsourced to be stored at the third party such as cloud service providers where those information could be exposed to unauthorized users and third party servers. to ensure the control over access to users PHR it is secure to encrypt the PHR before outsourcing ,there have been variety of risks of flexible access , key management, privacy exposure and user revocation ,have remained the most important challenges that leads to cryptographically enforced data access control . In this paper, I propose novel patient centric framework and suite of access policy to PHR‟s to be outsourced. scalability in key management and high degree of user (patient) privacy is achieved by exploiting multi owner attribute based encryption (ABE) .my scheme also enables dynamic modification of access policies or file attributes, user revocation, emergency access through break – glass access.