Research on privacy-preserving keyword retrieval technology in cloud storage

Cloud storage provides scalable storage resources which are available everywhere. Privacy has become the key problem of cloud storage. Encryption is a well established technology for protecting sensitive data. But it makes effective data utilization and sharing a very challenging task. To solve the problem, a privacy-preserving framework of cloud storage was proposed, and a bilinear map-based search scheme on encrypted keyword (BMSEK) was constructed. The performance evaluation and security analysis show that the running overhead of BMSEK is smaller, and BMSEK is se-mantic security and can support privacy protection and data sharing well while realizing encypted keywords retrieval.