Three-tier Structure Design of Database Security

A key technology for database security is database encryption.Nowadays,one effective method for database encryption is to encrypt sensitive fields,and one sensitive field corresponds to a key,while the generation and security storage of the encryption key is the key problems.This paper proposes one new double encryption-key mechanism,in which the DES encryption algorithm is employed to get application keys from encryption transform of the main keys.The user just considers how to get secure storage of main keys,while considers no security storage and communication of the application keys.This natural combination integrating the security of the encryption algorithm and complex transformation generates the application keys,thus to provide reliable guarantees for the generation and management of the key in the database encryption.