International Journal of Engineering and Technology

Cloud computing today is widening its wings in all fields, where a Personal Health Record is coming up as an important area of interest. But due to sensitivity of the records stored, security and efficient sharing methodology is the need of the hour. Patient information stored in a third party i.e. Cloud service Provider (CSP) needs to be accessed by different domains of user, needing different level of information. We are proposing Attribute Based Encryption (ABE) to provide the user only the necessary information and distributing the key of those attributes. Also, Hacking of user profiles is a common scenario, so to further strengthen the security of PHR we introduce A Trust based Dynamic Reputation Architecture. Trust based system restricts the access of crucial data using dynamically calculated reputation. CSP first authorizes the user using its identity and trust before providing it the encrypted PHR.