1. Lesson 6 Computer Ethics

2. Computer Ethics
• Computer Ethics refers to the rules or principles
that deals with the right and wrong way of using
the computer together with the moral duty and
obligation of computer users

3. 10 Commandments of Computer Ethics
• 1.Thou shall not use a computer to harm other
people.
it is unethical to change or mess with other
people’s file or computer system. An example is
by sending spam e-mails which can harm other
user’s account

4. 10 Commandments of Computer Ethics
• 2. Thou shall not interfere with other people’s
computer work
Making changes to other people’s files without
their approval is unethical. Same with creating
computer viruses that would display annoying
messages, corrupt files, and erase data

5. 10 Commandments of Computer Ethics
• 3. Thou shall not snoop around in other people’s
files
• oObtaining and looking at other’s files without
permission is not proper. Reading personal
documents, letters, and e-mail messages of
others is invading their privacy

6. 10 Commandments of Computer Ethics
• 4. Thou shall not use a computer to steal
Breaking into bank accounts and transferring
money through the use of computers is stealing.
Some as tampering programs and computerized
equipment such as ATM to get funds

7. 10 Commandments of Computer Ethics
• 5. Thou shall not use or copy software for which
you have not paid.
Creating duplicate copies of software and buying
and using pirated CDs.

8. 10 Commandments of Computer Ethics
• 6. Thou shall not use a computer to bear false
witness
Spreading rumors about a person or an
organization through the Internet is against
ethical use of the computer. Giving out false
information through websites or newsgroups
and spreading black propaganda by sending emails with false information about a person, an
idea, or an organization is improper

9. 10 Commandments of Computer Ethics
• 7. Thou shall not use other people’s computer
resources without authorization or proper
compensation
Accessing systems through unauthorized us of
ID’s usernames and passwords is hacking and it
is unethical

10. 10 Commandments of Computer Ethics
• 8. Thou shall not appropriate other people’s
intellectual output
Using the ideas and words of others without
clearly acknowledging the author or source of
that information is unethical. Copying computer
programs and ideas without the consent of the
owner is considered as plagiarism which is
against the law. It is a violation of other people’s
intellectual property rights

11. Lesson 5 Virus

12. Computer Virus
• Computer virus is a program which reproduces
itself. It may attach to other programs which
may create copies of it. It may damage or corrupt
data, change data, or degrade the performance
of your system by utilizing resources such as
memory or disk space

13. History of Computer Virus

14. 1971 – “The Creeper”
• It was developed by programmer Bob Thomas of BNN Technologies to
actively explain a mobile application on how a virus infiltrate and be
replicated throughout a localized computer network. It was never
intended for harm

15. 1971 – “The Creeper”
•The Creeper was first detected in ARPANET, the
defense department’s precursor the global
Internet, the World Wide Web as what we now
know as today. At this point, delivered a
message, “ I’m the creeper, catch me if you can, ‘
then it would move on to another system in the
network. ‘the Reaper’ was designed to chase
down and delete the creeper

16. 1986 – Brain Virus
• Brain virus was created by two Pakistani
brothers, Amjad and Basit Farooq Alvi. This
virus, which spread via floppy disks, was known only
to infect boot records and not computer hard drives
like most viruses today.
• The virus also known as the
Lahore, Pakistani, Pakistani Brain, Brain-A and
UIUC would occupy unused space on the floppy disk
so that it could not be used and would hide from
detection. It would also disguise itself by displaying
the uninfected boot sector on the disk

17. 1987 – Lehigh Virus
• Lehigh Virus was discovered at Lehigh
University in the United States. The Lehigh virus
was the first memory resident file infector that
attacked executable files and took control when
a file was opened.

18. 1987 – Jerusalem Virus
• The Jerusalem virus also appeared this year at
Hebrew University in Israel. The Jerusalem
virus was also a memory resident file infector. It
contained bugs to re-infect programs that were
already infected.

19. 1988 – Cascade Virus
• The first anti-virus was designed to detect and remove Brain virus.
The anti-virus also immunized floppy disks to get rid of the Brain
infection. At the same time, the Cascade virus appeared in Germany.
The Cascade virus was the first encrypted virus, which was coded
and could not be changed or removed
• During the late 1980’s and the early 1990’s viruses on the loose
which infected files, disks, etc. on the computer and caused a great
deal of damage received a lot of media attention. Magazines such as
Business week, Newsweek and PC magazine began publishing
articles about these destructive viruses running wild and demanded
a solution for all these problem

20. 1991 – Norton Anti-virus
•Symantec released the Norton Anti-virus
software. Anti-virus products from IBM,
McAfee, Digital Dispatch and Iris also became
available

21. 2000 – ILOVEYOU virus
•The ILOVEYOU virus wreaked havoc around the
world. The virus that was created here in Philippines
and was sent through email and spread around the
world in one day infecting 10 percent of computers
connected to the Internet and causing $5.5 billion
dollars in damage. Hence, viruses are still common
and still create chaos even today. It is hard to
determine the reasons for all these actions and why
virus writers create computer viruses. Some do it for
their personal gain, for research
projects, pranks, vandalism, etc., while others want
to help make improvements in programs

22. Categories of Computer Viruses
• 1.Boot Sector Virus
• 2.Master Boot Record
Virus
• 3.File Infector Viruses
• 4.Macro Viruses
• 5.Resident Viruses
• 6.Worms
• 7.Trojan Horses
• 8.Directory Virus
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9. Overwrite Viruses
10. Polymorphic Virus
11. Logic Bombs
12. FAT Virus
13. Multipartite Virus
14. Web Scripting
Virus
• 14. Direct Action Virus

23. Signs of Computer Infection
•A computer virus is usually
hard to detect if it’s
disguised as a harmless
file, in the case of a Trojan
horse virus. This type of
virus doesn't replicate
itself like most viruses, but
instead opens your
computer up to malicious
imposters
• –Your computer functions
slower than normal
• –Your computer responds
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slowly and freezes often
–Your computer restarts
itself often
–You see uncommon error
messages, distorted
menus, and dialog boxes
–You notice applications
on your computer fail to
work correctly
–You fail to print correctly

24. Virus Removal Tools
• It is a software for removing specific viruses
from infected computers. Unlike complete
antivirus scanners, they are usually not intended
to detect and remove an extensive list of viruses;
rather they are designed to remove specific
viruses, usually more effectively than normal
antivirus software