Security refers to providing a protection system to computer system resources such as CPU, memory, disk, software programs and most importantly data/information stored in the computer system. If a computer program is run by an unauthorized user, then he/she may cause severe damage to computer or data stored in it.

1. SECURITY
ISSUES
PRESENTED BY DEV ADNANI

2. OPERATING SYSTEM
An operating system is system software that manages
computer hardware, software resources, and provides
common services for computer programs

3. INTRODUCTION TO OS SECURITY
ISSUES
• The OS security issue is a critical issue.
• Each process determines whether it has a control of a system
resource exclusively or whether it is isolated from the other
processes
• The OS then configures when a resource is isolated from from one process
and a resource is shared with a defined with a define set of processes
• The OS should also have the flexibility to change this configuration when
needed, to full fill the requirements all the process.

4. • The OS should provide protection mechanism
and implement a system administration(s) –
defined security policy.
• An application software programmer can find a hole
in the protection mechanism and an unauthorized access.

5. IMPORTANT SECURITY
ISSUES

6. PROTECTION
MECHANISM
• OS should provide protection mechanisms and implement a
system administrator defined security

7. FLEXIBILITY TO OF CHANGE
• When needed to fulfill the need requirements of all the processes
• For example, a process has control of 32 memory blocks at an instance
and the OS configured the system accordingly.
• Later when more processes are created, this can be reconfigured.

8. CONFINEMENT MECHANISM
• Mechanism that restricts sharing of parameters to a set of processes
only .

9. SECURITY POLICY
• Rules for authorizing access to the OS, system and information
• A policy example is that a communication system may having a policy
of peer-to-peer communication

10. AUTHENTICATION MECHANISM
• External authentication mechanism for the user and a mechanism
meant to prevent an application run unless the user registers and the
system administrator (software) authorizes
• Internal authentication for the process, and the process should not
appear as some like other processes.
• User authentication can become difficult if
the user disseminates password , passwords
or other authentication methods

11. AUTHORIZATION
• User or process (s) allowed to use the system resources as per the
security policy

12. ENCRYPTION
• A tool to change information to make it unusable by any other user or
process unless without the appropriate key is used for deciphering it.

13. • OS security issues are important
considerations
CONCLUSIO
N
• Protection of memory and resources from
any unauthorized and without explicit
authorization write into the resource
• Mix up of accesses of one by
another, becomes imperative from an OS
security and protection mechanism

14. THE END
PRESENTED BY DEV ADNANI
IU1983830001