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Cloud computing has generated much interest in the recent years for its many advantages, but has also raise many security and privacy concerns. Storage and access of confidential documents have been identified as a major problem in the area. Many researchers investigated solutions to search over encrypted documents stored on remote cloud servers. Day to day usage of cloud has attracted attackers to break data security in the cloud data storage system. Security of cloud data is ensured by means of cryptographic keys which when exposed facilitates the attackers access the confidential data. In this paper, we present a Survey on various search technique along with the security issues raised by these technique on encrypted data.Index Terms: Cloud, Storage, privacy and security I. INTRODUCTIONIn recent times organizations and individuals adopt cloud technologies, many have become aware of the serious concerns regarding security and privacy of accessing personal and confidential information over the Internet. In particular, the recent and continuing data breaches highlight the need for more secure cloud storage systems. It is generally agreed that encryption is necessary, cloud providers often perform the encryption and maintain the private keys instead of the data owners. That is, the cloud can read any data it desired, providing no privacy to its users. The storage of private keys and encrypted data by the cloud provider is also problematic in case of data breach. Hence, researchers have actively been exploring solutions for secure storage on private and public clouds where private keys remain in the hands of data owners. We describe modifications to the scheme to lower storage cost at a small cost in response time and to defend against cloud providers with statistical knowledge on stored data Although phrase searches are processed independently using our technique, they are typically a specialized function in a keyword search scheme, where the primary function is to provide conjunctive keyword searches.II. BACKGROUND

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