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Access controls based on Security Labels are made by matching the Security Label against the Security Clearance of the user or location for which the access control check is being made. In order for this check to be valid, it is essential that the correct value of the Security Clearance is used. If an incorrect value of the Security Clearance (e.g., a forged one) was used, the access control check would be worthless. This paper looks at how to ensure that the correct Security Clearance is used, and the role of directory in achieving this.
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