This document discusses operating system (OS) security. It defines protection as controlling access to system resources and security as ensuring integrity, confidentiality, and availability. It identifies threats like unauthorized access, unauthorized resource use, and malicious data modification. It discusses security issues like physical security, authentication, software vulnerabilities, and malware. It recommends precautions like BIOS security, user account security, data security, antivirus software, and firewalls. Finally, it states that Linux and other UNIX-based systems are among the most secure operating systems currently.

1. NADAR SARASWATHI COLLEGE OF
ARTS AND SCIENCE

2. What is protection
The process in an operating system must be protected
from one another’s activities.
Protection refers to a mechanism for controlling the
access of programs, processes, or users to the resources
defined by a computer system.

3. What is security
Operating system security is the process of ensuring os
integrity, confidentiality and availability.
OS security refers to specified steps or measures used to
protect the OS from threats, viruses, worms, malware or
remote hacker intrusions.

4. Security Threats In OS
Unauthorized Access of the system by cracking the access
security methods and spoofing authentication for gaining
full access of the system.
Unauthorized use of resources use of resources by
installation of daemons running an unkown file server, or
logging every activity of target’s system like keystrokes.

5. Security threats
Malicious Modification of data which may have serious
indirect consequences.
Viruses are one of the greatest dangers for systems. If
they are once on the system, they can do a lot of damage
to the system.

6. OS Security Issuse
Among the issues to be considered these are the important
ones:
Physical Security
Authentication
Software vulnerabilities
Malwares

7. Precautions for OS Security
 To Secure Our system and to avoid the security breaches we
must take some precautions in our OS.
 So we have to ensure of the shown security components:
Bios Security
User Accounts Security
Data Security
Antivirus Security
Firewall

8. Most secure OS
 Now days Linux, Windows and other UNIX based
systems are the most secure operating systems.
 Because it has very less number of viruses and malwares
as compared to windows.
 Example:
 Ubuntu, Opernsuse, Fedora, RedHat etc.

9. Thank you