RSAE: Ranked Keyword Search over Asymmetric Encrypted cloud data

Cloud computing becomes more and more popular and is applied into many practical applications because of much cheaper and more powerful features. In cloud system, users can outsource local data to the cloud servers to lighten their local storage and computing resource loads, which products a new industry method of use-on-demand, pay-on-use. However outsourcing data to cloud servers makes sensitive information centralized into the server, which brings great challenge to protecting sensitive information privacy. For privacy preserving, the user encrypts sensitive data before outsourcing. Traditional searchable encryption methods make it possible for users to securely conduct keyword search over encrypted data and finally retrieve the most relevant Top-N files among the whole data. In this paper, we systematically propose a scheme to solve the problem of how to securely and efficiently retrieve the Top-N files by keyword-based searching over encrypted data by asymmetric encrypted.