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Security in grid environment is still a major challenge considering the possible security breaches that can occur in a multi-institutional resource sharing infrastructure. Unlike the Internet, grid is a dynamic collection of resources, users and services that poses increased security challenges to the research community. This paper address the need for a dynamic network firewall in grid environment for supporting its dynamic nature whereby, protecting it from network intrusions. In this vision, it brings out the need for host-based access privileges and the importance of these privileges in addressing security challenges imposed by the grid environment.
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