Security issues in OS

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            Security issues 

- The os security issues is critical issue.
- Each processes determines whether it has control of a system resource exclusively or whether it is isolated from the other processes or whether it shares resource common to set of processes.

- the os then configures when a resource is isolated from one process and a resource is shared with a defined set of processes.

- The os should also have the flexibility to change this configuration when needed to full fill the requirement all the processes.

- For example , a process has 32 memory blocks at an instance and the os configures the system accordingly.

- The os should provide protection mechanism and implement a system administrator(s) - defined security policy.

- An application software programmer can find a hole in the protection mechanism and an unauthorized access.

Important security issues :-
1. Protection mechanism
2. Flexibility to change.
3. Control resource sharing 
4. Confinement mechanism
5. Security policy
6. Authentication mechanism
7. Authorization
8. Encryption


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