A Completeness and Freshness Guarantee Scheme for Outsourced Database

Outsourced database system (ODS) has become more and more popular recently. In ODS, the database is outsourced on the third-party service provider and usually the providers are untrusted. Thus, the security of the outsourced database become an important challenge, the ODS must introduce some mechanisms to protect the security of the database information. Previous work has used encryption to provide the protection for the privacy and confidentiality of the database, and integrity can be guaranteed by adopting one-way hash function. In contrast, the other aspects of security, especially freshness and completeness, are important issues but have not been researched in detail. In this paper, we develop a mechanism to provide freshness guarantee while ensuring the completeness. In our mechanism, we use small amounts of data insertion in the outsourced database, called fake attribute, to achieve our goals.