Abstract: Cloud Computing represents vital role in Information Technology. Cloud Computing provides high security for managing & storing large scale data in internet-based Infrastructure. Cloud provides large storage space & make user friendly for fast accessing data. Searchable Symmetric Encryption (SSE) use to secure and retrieve data from the cloud and it also focus on addressing data privacy issues. We observe that server side ranking based on Order Preserving Encryption (OPE) certainly leaks data privacy.OPE use Boolean search technique. To remove the leakage of data, we propose Two Round Searchable Encryption (TRSE) scheme that supports top-k multi-keyword retrieval. In TRSE, we use Vector Space Model & Homomorphic Encryption. This proposed scheme guarantees high security and practical efficiency.

Keywords: Cloud, Data privacy, Homomorphic Encryption, Vector Space Model, SSE, OPE