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IPSec (Internet Security Protocol Suite) functions will be executed correctly only if its policies are correctly specified and configured. Manual IPSec policy configuration is inefficient and error-prone. An erroneous policy could lead to communication blockade or serious security breach. In addition, even if policies are specified correctly in each domain, the diversified regional security policy enforcement can create significant problems for end-to-end communication because of interaction among policies in different domains. A policy management system is, therefore, demanded to systematically manage and verify various IPSec policies in order to ensure an end-to-end security service. This paper contributes to the development of an IPSec policy management system in two aspects. First, we defined a high-level security requirement, which not only is an essential component to automate the policy specification process of transforming from security requirements to specific IPSec policies but also can be used as criteria to detect conflicts among IPSec policies, i.e. policies are correct only if they satisfy all requirements. Second, we developed mechanisms to detect and resolve conflicts among IPSec policies in both intradomain and inter-domain environment.

IPSec/VPN Security Policy: Correctness, Conflict Detection, and Resolution