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Introduction to security

I/O management

The I/O management subsystem controls all the input and output of the computer system. For the enforcement of security, the most important things that the I/O management subsystem does are

During the transfer of blocks or streams of data, and during character I/O operation, each I/O transaction is completely separate from all others. It follows a well-known and well-defined path; therefore, the integrity of all data is maintained during data transactions. Moreover, DAC permissions are enforced, securing the data from unauthorized access.
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