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Security of a computer system is a crucial task. It is a process of ensuring confidentiality and integrity of the OS. A system is said to be secure if its resources are used and accessed as intended under all the circumstances, but no system can guarantee absolute security from several of the various malicious threats and unauthorized access.

The notes of System Security below includes following topics:

• Introduction to system security

• Design principles of system security

• Cryptography

• Database Security

• Operating system security