Research of security structure model for web application systems based on the relational database

Security structure model is a researching difficulty in web application systems based on the relational database. On the basis of the analysis of the security problems of existent web application systems, the paper proposes a security structure model for web application systems based on the relational database. The security structure model consists of application layer, business layer, data layer and security control layer. The security control layer is mainly used to provide safety services, such as integrity and secrecy of data, undeniable service, two-way certification, algorithm of digital signature and security key distribution etc. The paper also defines functions for each layer and describes authentication, encryption, decryption and transmitting data flow for the new structure. The deficiencies and security problems in the traditional structure model are resolved in the safeguard mechanism in the new structure model.