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Access control mechanisms control which subjects (such as users or processes) have access to which resources. To facilitate managing access control, policy authors increasingly write access control policies in XACML. Access control policies written in XACML could be amenable to multiple-duty-related security leakage, which grants unauthorized access to a user when the user takes multiple duties (e...
To formally and precisely capture the security properties that access control should adhere to, access control models are usually written to bridge the rather wide gap in abstraction between policies and mechanisms. In this paper, we propose a new general approach for property verification for access control models. The approach defines a standardized structure for access control models, providing...
Access control is one of the most fundamental and widely used security mechanisms. Access control mechanisms control which principals such as users or processes have access to which resources in a system. To facilitate managing and maintaining access control, access control policies are increasingly written in specification languages such as XACML. The specification of access control policies itself...
Many researchers have tackled the architecture and requirements aspects of grid security, concentrating on the authentication or authorization mediation instead of authorization techniques, especially the topic of policy combination. Policy combination is an essential requirement of grid, not only because of the required remote (or global) vs. local interaction between grid members, but also the dynamic...
In computer security, many researches have tackled on the possibility of a unified model of access control, which could enforce any access control policies within a single unified system. One issue that must be considered is the efficiency of such systems, i.e., what is the computational complexity for the enforce ability validation of access control rules of a system that is capable of implementing...
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