An efficient multi-keyword synonym-based fuzzy ranked search over outsourced encrypted cloud data

Abstract

Cloud computing is a paradigm for large-scale distributed computing. The sensitive data should be outsourced to the cloud and stored in an encrypted format to keep it confidential. The existing search schemes do not suggest keywords consequently making the retrieving of documents difficult if user forgets the keyword. In this paper, we propose a multi-keyword synonym based fuzzy ranked search (MSFRS) scheme over outsourced encrypted cloud data which provides efficient search results retaining the security features of the existing schemes. It supports multi-keyword, suggests synonyms if user forgot keyword and returns results after evaluating relevance scores based on frequency of keyword in the documents bearing same rank. The performance analysis of the proposed scheme on the dataset concluded that time taken to update the index file has been reduced up to 45% over outsourced encrypted cloud data.