EXPERIMENTAL STUDY ON CLOUD SECURITY FOR PERSONAL HEALTH RECORDS OVER PATIENT CENTRIC DATA

Cloud computing offers many services among one is Storage as a service. Using this service user can outsource his data and whenever required he can download or he can share with others. Using cloud computing PHR owner can share his documents, but due to security challenges in cloud computing the health records of owner must be encrypted before outsourcing. In order to provide security for owner health records ABE (attribute based encryption) is best suitable for other encryption techniques. Using ABE the PHR owner can define access control over his encrypted cloud data. But using ABE dynamic polices over encrypted cloud data is big challenge. In this paper for achieving grant and revoke privileges over encrypted data Timestamp server is introduced