This paper is a continuation of our last paper [1] which describes the theory of Virt-BLP model. Based on Virt-BLP model,this paper implements a mandatory access control(MAC) framework applicable to multi-level securi...This paper is a continuation of our last paper [1] which describes the theory of Virt-BLP model. Based on Virt-BLP model,this paper implements a mandatory access control(MAC) framework applicable to multi-level security(MLS) in Xen. The Virt-BLP model is the theoretical basis of this MAC framework,and this MAC framework is the implementation of Virt-BLP model. Our last paper focuses on Virt-BLP model,while this paper concentrates on the design and implementation of MAC framework. For there is no MAC framework applicable to MLS in virtual machine system at present,our MAC framework fills the blank by applying Virt-BLP model to Xen,which is better than current researches to guarantee the security of communication between virtual machines(VMs) . The experimental results show that our MAC framework is effective to manage the communication between VMs.展开更多
In order to develop highly secure database systems to meet the requirements for class B2, the BLP （Bell-LaPudula） model is extended according to the features of database systems. A method for verifying security mode...In order to develop highly secure database systems to meet the requirements for class B2, the BLP （Bell-LaPudula） model is extended according to the features of database systems. A method for verifying security model for database systems is pro- posed. According to this method, an analysis by using Coq proof assistant to ensure the correctness and security of the extended model is introduced. Our formal security model has been verified secure. This work demonstrates that our verification method is effective and sufficient.展开更多
安全性和灵活性是各种改进的BLP模型追求的目标.如何在保持安全性的前提下增加BLP模型的灵活性,一直是安全操作系统研究人员研究的重点.安全模型是系统设计的基础,如果在系统中实现了不安全的“安全模型”,其后果是严重的.结合多级安全(...安全性和灵活性是各种改进的BLP模型追求的目标.如何在保持安全性的前提下增加BLP模型的灵活性,一直是安全操作系统研究人员研究的重点.安全模型是系统设计的基础,如果在系统中实现了不安全的“安全模型”,其后果是严重的.结合多级安全(MLS)的核心思想,通过实例列举的方式深入分析了两个改进的BLP模型——DBLP(dynamic BLP)和SLCF(security label common framework).尽管这两个模型都提出了在系统运行时动态地调整主体安全级的规则,但是分析表明,它们还是不安全的.在这两个模型的规则控制下,特洛伊木马可以通过显式地读和写操作将高安全等级的信息泄漏给低安全等级的主体,从而违反了多级安全(MLS)策略.研究结果为人们避免选用不安全的模型提供了有意义的理论支持.展开更多
基金supported by National Key Basic Research and Development Plan (973 Plan) of China (No. 2007CB310900)National Natural Science Foundation of China (No. 90612018, 90715030 and 60970008)
文摘This paper is a continuation of our last paper [1] which describes the theory of Virt-BLP model. Based on Virt-BLP model,this paper implements a mandatory access control(MAC) framework applicable to multi-level security(MLS) in Xen. The Virt-BLP model is the theoretical basis of this MAC framework,and this MAC framework is the implementation of Virt-BLP model. Our last paper focuses on Virt-BLP model,while this paper concentrates on the design and implementation of MAC framework. For there is no MAC framework applicable to MLS in virtual machine system at present,our MAC framework fills the blank by applying Virt-BLP model to Xen,which is better than current researches to guarantee the security of communication between virtual machines(VMs) . The experimental results show that our MAC framework is effective to manage the communication between VMs.
基金the National High Technology Research and Development Program of China (2006AA01Z430)
文摘In order to develop highly secure database systems to meet the requirements for class B2, the BLP （Bell-LaPudula） model is extended according to the features of database systems. A method for verifying security model for database systems is pro- posed. According to this method, an analysis by using Coq proof assistant to ensure the correctness and security of the extended model is introduced. Our formal security model has been verified secure. This work demonstrates that our verification method is effective and sufficient.
文摘安全性和灵活性是各种改进的BLP模型追求的目标.如何在保持安全性的前提下增加BLP模型的灵活性,一直是安全操作系统研究人员研究的重点.安全模型是系统设计的基础,如果在系统中实现了不安全的“安全模型”,其后果是严重的.结合多级安全(MLS)的核心思想,通过实例列举的方式深入分析了两个改进的BLP模型——DBLP(dynamic BLP)和SLCF(security label common framework).尽管这两个模型都提出了在系统运行时动态地调整主体安全级的规则,但是分析表明,它们还是不安全的.在这两个模型的规则控制下,特洛伊木马可以通过显式地读和写操作将高安全等级的信息泄漏给低安全等级的主体,从而违反了多级安全(MLS)策略.研究结果为人们避免选用不安全的模型提供了有意义的理论支持.
