The DAS (Database-As-a-Service) is a new model for data management, it faces a big problem on the issue of security in DSP (Database Service Provider). Database encryption is the foundation stone to provide strong security for database. However, the encrypted database both have low efficiency on queries or processing and have limited SQL queries under traditional database encryption methods. Aiming at the problems, a kind of new database encryption method is presented in this paper. Unlike the traditional database encryption methods, this method does not rely on data encryption. It ensures data security through the decomposition and synthesis of relational Schemes. At the same time, the query processing of the method is described in DAS, and the security of the method is analyzed. The experiments show that the query efficiency of encrypted database is better than the traditional database encryption methods.
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