Keyword Search over Outsourced Cloud Data with Improved Ranking Techniques
Cloud computing becomes prevalent, sensitive information are being increasingly centralized into the cloud. For the protection of data privacy, sensitive data has to be encrypted before outsourcing, which makes effective data utilization a very challenging task. Although, traditional searchable encryption schemes allow users to securely search over encrypted data through keywords, without capturing any relevance of data files. Ranked search greatly enhances system usability by enabling search result relevance ranking instead of sending undifferentiated results and further ensures the file retrieval accuracy. The statistical measure approach, i.e. relevance score, from information retrieval to build a secure searchable index.