The popular operating systems today are Microsoft NT 4.0 and Windows 2000. These operating systems offer a great deal of control over resources to endusers in the form of discretionary access control. Typically, corporate documents are stored on these operating systems in an insecure manner. Our highest threat to our data is our users, as supported by a 2001 Information Security Magazine survey. 58 percent of the 2545 IT managers cited abuse of access controls as an internal breach.1 Further, SANS lists “Unprotected Windows Networking Shares” as one of the top twenty vulnerabilities.2 Discretionary access control for the Microsoft operating systems needs to be better understood.
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