Enabling secure outsourced cloud data

Cloud computing relies on sharing of resources to achieve coherence and economies of scale, similar to a utility (like the electricity grid) over a network, foundation of cloud computing is the broader concept of converged infrastructure and shared services. Sensitive clouds data to be encrypted before outsourced to the commercial cloud environment, makes effective data utilization. In this paper, define and solve the problem of ranked keyword search over encrypted cloud data. Enhance system usability through enabling search result relevance, instead of sending undifferentiated results and further ensures file retrieval accuracy by Ranked search. Specifically, The statistical measure explore, i.e, relevance score, from information retrieval to build a search index, a one-to-many order-preserving mapping technique to properly protect (RSA) sensitive score information. Hence, supporting score dynamics in the searchable index for an RSSE system, corresponding file collection updates reflect practical importance, search result authentication mechanism that can detect such unexpected behaviors of cloud server is also of practical interest and worth further investigation.