Now a day every information is stored and shared on the cloud. And so the medical record especially
Personal Health Record (PHR) is an important part of health information exchange, that is need to be
stored at cloud servers. But there are various privacy problems as personal health information could be
discovered to unauthorized people. That need guarantee of the patient control over to their own PHRs,
in this method encryption of the PHRs is done before the storage on cloud. But still issues like risks
of privacy, efficiency in key administration, flexible access and efficient user administration, have still
remained the important challenge toward achieving better, cryptography imposed data access control.
In this research development, we develop a mechanism for control of data access to PHRs stored in
cloud servers. To achieve this efficient and modular data access control for PHRs, we provide encryption
approach for the encryption to each PHR file. For this system method already tried to focus on the
multiple data ownership scheme also dividing the users into security domains that highly reduce the
key management complication for owners and users. Here the system takes patient privacy as serious
issue and guaranteed it by exploiting multi-authority Encryption. Our main aim is not only privacy
but also systems scheme try to enable modification of access policies or file attributes, and break-glass
access under emergency situations. Our proposed scheme shows Extensive analysis and experimental
results are presented for security and efficiency of PHR.