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Grid Computing has emerged as core computing technology in many distributed applications initiated by different organizations all over the world. It aims to enable large scale resource sharing. Security is a big and challenging issue as a grid service may impact number of other services/resources distributed over wide area networks. The dynamic and multi- institutional nature of grid applications introduces challenging security issues that require new technical approaches. This paper proposes, at an abstract level, a framework for handling security issues in grids. The framework is capable of addressing both, generic as well as application specific security issues of grid services.