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Discretionary access control (DAC)
A means of restricting access to objects based on the identity of subjects and groups to which they belong. The controls are discretionary in the sense that a subject with certain access permission is capable of passing that permission on to another subject. Means of restricting access to objects based on the (DAC) identity and needtoknow of users and/or groups to which the object belongs. Controls are discretionary in the sense that a subject with a certain access permission is capable of passing that permission (directly or indirectly) to any other subject. (. See mandatory access control. )
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MAC is a means of restricting access to data based on varying degrees of security requirements for information contained in the objects. A policybased means of restricting access to objects based on the sensitivity (as represented by a label) of the information contained in the objects and the formal authorization (access control privileges) of subjects to access information of such sensitivity. Means of restricting access to objects based on the sensitivity of the information contained in the objects and the formal authorization (i. e. , clearance, formal access approvals, and needtoknow) of subjects to access information of such sensitivity. (. See discretionary access control. )
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In the context of object-oriented programming, the forwarding of a request by an object to another object or delegate. An object delegates if it does not have a method to handle the message. The notation that an object can issue a request to another object in response to a request. The first object therefore delegates the responsibility to the second object. Delegation can be used as an alternative to inheritance.
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(1) Discretionary access control. (2) Dual attached concentrator. Discretionary Access Control
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A model that employs a directed graph to dictate how rights can be passed from one subject to another or from a subject to an object. Simply put, a subject with the grant right can grant another subject or another object any other right they possess. Likewise, a subject with the take right can take a right from another subject.
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An access control list is the usual means by which access to, and denial of, service is controlled. It is simply a list of the services available, each with a list of the hosts permitted to use the services. Most network security systems operate by allowing selective use of services. Mechanism implementing discretionary and/or mandatory access control between subjects and objects. The column of an access control matrix that specifies what level of access each subject has over an object.
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