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XACML has become the de facto standard for specifying access control policies for various applications, especially web services. With the explosive growth of web applications deployed on the Internet, XACML policies grow rapidly in size and complexity, which leads to longer request processing time. This paper concerns the performance of request processing,(More)
Firewalls are the mainstay of enterprise security and the most widely adopted technology for protecting private networks. As the quality of protection provided by a firewall directly depends on the quality of its policy (i.e., configuration), ensuring the correctness of firewall policies is important and yet difficult. To help ensure the correctness, we(More)
—Most prior research on policies has focused on correctness. While correctness is an important issue, the adoption of policy-based computing may be limited if the resulting systems are not implemented efficiently and thus perform poorly. To increase the effectiveness and adoption of policy-based computing, in this paper, we propose fast policy evaluation(More)
Firewalls are the mainstay of enterprise security and the most widely adopted technology for protecting private networks. Ensuring the correctness of firewall policies through testing is important. In firewall policy testing, test inputs are packets and test outputs are decisions. Packets with unexpected (expected) evaluated decisions are classified as(More)
In order to facilitate managing authorization, access control architectures are designed to separate the business logic from an access control policy. To determine whether a user can access which resources, a request is formulated from a component, called a Policy Enforcement Point (PEP) located in application code. Given a request, a Policy Decision Point(More)
As security requirements of software often change, developers may modify security policies such as access control policies (policies in short) according to evolving requirements. To increase confidence that the modification of policies is correct, developers conduct regression testing. However, rerunning all of existing system test cases could be costly and(More)
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(More)
Mandatory access control (MAC) mechanisms control which users or processes have access to which resources in a system. MAC policies are increasingly specified to facilitate managing and maintaining access control. However, the correct specification of the policies is a very challenging problem. To formally and precisely capture the security properties that(More)
Access control policies are often specified in declarative languages. In this paper, we propose a novel approach, called mutation verification, to assess the quality of properties specified for a policy and, in doing so, the quality of the verification itself. In our approach, given a policy and a set of properties, we first mutate the policy to generate(More)
Access control mechanisms are a widely adopted technology for information security. Since access decisions (i.e., permit or deny) on requests are dependent on access control policies, ensuring the correct modeling and implementation of access control policies is crucial for adopting access control mechanisms. To address this issue, we develop a tool, called(More)