Question

explain how access matrix is used to protect the file system?​

Answer 1

Answer:

• Access Matrix is a security model of protection state in computer system. It is represented as a matrix.
• Access matrix is used to define the rights of each process executing in the domain with respect to each object.
• A process executing in domain D4 has same rights as D1 but it can also write on files.

Access matrix in Operating System

Access Matrix is a security model of protection state in computer system. It is represented as a matrix. Access matrix is used to define the rights of each process executing in the domain with respect to each object. The rows of matrix represent domains and columns represent objects. Each cell of matrix represents set of access rights which are given to the processes of domain means each entry(i, j) defines the set of operations that a process executing in domain Di can invoke on object Oj.