2. Physical Issues
 Environmental factors
 Your computer should be kept in a
 Dust free
 Dry (moisture free)
 Smoke free environment

3. Physical Issues
 Hardware protection
 Your computer should be equipped with
 A UPS (Uninterrupted Power Supplier) to avoid
risk of sudden power failure and fluctuations.
 Surge protection to protect against lightning
and thunder.
 Stabilizer to control voltage.

4. Logical security
 The software and the data in your
computer can be protected through the
use of
 Password
 Backups

5. Malicious codes
 A common misconception is that other
kinds of electronic nastiest such as worms
and Trojan horse applications are viruses.
 Viruses, worms and Trojan horse belong to a
broader category called “malicious codes”.

6. Virus
 A program or piece of code that is loaded
onto your computer without your knowledge
and runs against your wishes. Like any other
program, it contains instructions that tell
your computer what to do.

7. Virus
 Viruses can also replicate themselves.
 All computer viruses are man made.
 A simple virus that can make a copy of itself over again is
relatively easy to produce.
 A virus can be destructive; it could format your hard drive,
overwrite your hard drive boot sector or delete files and render
your machine inoperative.
 Even such a simple virus is dangerous because it will quickly use
all available memory and bring the system to a halt.
 An even more dangerous type of virus is one capable of
transmitting itself across networks and bypassing security
systems.

8. Virus
 How do viruses invade a machine?
 E-mail or an e-mail attachment
 Downloads
 Shared infected floppy disks
 Hacking (Occasionally)

9. Virus
 Trojan Horse
 A destructive program that masquerades as a
benign application. Unlike viruses, Trojan horses
do not replicate themselves.

10. Virus
 Worm
 A program or algorithm that replicates itself over a
computer network and usually performs malicious
actions.

11. Virus
 Virus
 A program or piece of code that is loaded onto
your computer without your knowledge and runs
against your wishes.

12. Virus
 Blended program
 Blended threats combine the characteristics of
viruses, worms, Trojan Gorses and malicious code
with server and Internet vulner abilities.

13. Virus
 Combating Viruses, Worms and Trojan Horses
 The first step to protecting your computer is to ensure
your operating system (OS) is up-to-date
 you should have anti-virus software installed on your
system and ensure you download updates frequently to
ensure your software has the latest fixes for new viruses,
worms and Trojan horses.
 You should also install a firewall as well.

14. Antivirus Software
 Antivirus software can detect nearly all types of
known viruses, but it must be updated regularly to
maintain effectiveness.

15. Firewall
 A firewall is a system that prevents unauthorized
use and access to your computer.
 A firewall can be either hardware or software.

16. Firewall
 Hardware firewalls provide a strong degree of
protection from most forms of attack from the
outside world can be purchased as a stand alone
product or in broadband routers.
 For individual home users, the most popular
firewall choice is a software firewall