Describe the access matrix model used for protection purpose

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Describe the access matrix model used for protection purpose?

 access matrix model


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Access Matrix is an abstract, formal security model of protection state in computer systems, that characterizes the rights of each subject with respect to every object in the system. An access matrix can be envisioned as a rectangular array of cells, with one row per subject and one column per object. The entry in a cell - that is, the entry for a particular subject-object pair - indicates the access mode that the subject is permitted to exercise on the object. Each column is equivalent to an access control list for the object; and each row is equivalent to an access profile for the subject.

In this matrix example there exists two processes, a file and a device. The first process has the ability to execute the second, read the file and write some information to the device, while the second process can only send information to the first.

Asset 1 Asset 2 file device
Role 1 read, write, execute, own execute rewrite
Role 2 read read, write, execute, own


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