A Formal Multilevel Database Security Model

Research of the security model is one of security system keys. The secrecy and the integrity are two important demands of security system. BLP model mainly satisfies the secret request , and Biba model emphasises the integrity  request. The  few security models unify the secrecy with the integrity. A mutilevel database security model increases integrity examination in the foundation of original secret request. The comparison way of the subject and the object is corresponded with the way of operating mode,and it stengthens the security and the usability of the system.LogicSQL database is the independent development high security rank database based on the linux. The multilevel database security model is applied in the LogicSQL database management system.