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This article provides a survey of Security in Grid Services coming from a study of many papers most of which were done by the Grid Forum OGSA-SEC (Open Grid Service Architecture Security) working group, GSI (Grid Security Infrastructure) working group, and Globus Alliance team and other people who contributed to Grid. It describes the best practice in terms of Grid Security Challenges, Grid Security Requirements, and the GT3 (Globus Toolkit version 3) Security Model for OGSA. Most of these were further refined in separate documents.