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Discretionary Access Control

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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

Discretionary access control, or DAC, is a form of access control to resources (directories and files) in which individual users can be assigned a unique type of access. For example, John can be allowed to both read and change a file, while Jim can be restricted to only reading the file. In contrast, nondiscretionary access control implies that all users accessing a resource receive the same rights-whatever share level you set for the resource.

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