Search over encrypted data is a technique of great interest in the cloud computing era, because many believe that sensitive data has to be encrypted before outsourcing to the cloud servers in order to ensure user data privacy. A secure and privacy preserving encrypted keyword search scheme suitable for cloud storage. In this secure and efficient privacy preserving search keyword on encrypted data approach contains three participants are there: 1) user 2) key server 3) CSP. A cloud service provider (CSP), whose purpose is mainly for making a profit, to take the custody of sensitive data, raises underlying security and privacy issues. In this paper we propose an efficient, secure and privacy preserving keyword search scheme which supports multiple users with low computation cost and flexible key management and it is proved to be secure and flexible.