Secure and Scalable Sharing Of Personal Health Records (PHR) In Cloud Computing Using Multi Authority Attribute Based Encryption

Personal health records (PHR) is an emerging centric patient model of health information exchanges, which is often stored at a third party. Such as cloud providers so there is been better privacy provided by considering the personal health information's so that, they will no longer be accessible to the third party servers and other parties .So some specific issues like privacy exposure, scalability in key management, flexible access and efficient user revocation these process can be achieved. The stored data will be in the form of cryptography so here in the existing system it uses attribute based encryption (ABE) in order to maintain each patient's PHR file .so here we focus on multi authority attribute based encryption (MABE) to maintain the PHR for every clients in making modification of access policies or file attributes, supports efficient on demand user/attribute revocation and emergency scenarios. Extensive analytical and experimental results are presented which show the security, scalability and efficiency of our proposed scheme.