Questions

Fill in the spaces to form correct sentences:

1- Data and information security is to keep………………of

information, Data, the used sets, the individuals working in an

organization or an institution.

2- The elements to be protected are…………

3- Security concept means……………sources in correct

ways………….managing and organizing relationships and

communication inside………….without any effect on the ability of

the computer user.

4- There is a protection for the Copyrights of the programme

designers through………….

Viruses

Viruses

Viruses are the most dangerous things that threaten Data and corrupt

them. This danger can threaten also information and Data safety. This

worried computer users because this leads to the loss of important data. We

will know in this lesson what a Virus means.

Virus concept

The organic Virus

Viruses are the primary reason for man's infection with diseases. These

Viruses are able to move, spread, reproduce and may cause infection to

other persons.

The computer Virus

A little programme has the ability to reproduce and spread. It contains a

number of orders that destroy or delete the programmes or data found on the

computer.

- You may have one of these questions:

1- Why have we chosen the organic virus as a name for the computer virus?

2- What are the similarities between the organic and computer viruses?

To answer these questions, we notice the following two sets of comparisons:

The comparison	Organic Viruses	Computer Viruses
effect	Changes the functions of the living cells	Changes the functions of some programmes
Reproduction and spreading	Reproduce to destroy other healthy cells	Reproduces and makes other copies to infect a large number of programmes
Dormant	Man can carry the virus without symptoms	The computer may be infected by the virus but it is inactive

Causes for Virus appearance:

1- Protecting the original programmes from copying by illegal users.

2- For trade, as some companies started to produce anti-virus programmes.-

3- To make propaganda and to advertise for the mental property products.

4- The anti-virus programmes show the extent of the programme designer

intelligence.

Viruses Properties:

Virus has the following properties:

1- It is dormant. The virus may be existed but not active.

2- It reproduces. The virus is able to reproduce by making another a

copy for itself in the memory or in the files.

3- It can move. The virus moves from the corrupted files to other files.

4- It puts signs and marks the infected files.

5- It has the ability of executing. It can execute corrupting orders but

with conditions.

6- It has the ability of destruction to be able to cause corruption and disorder.

The places which the virus attacks:

The virus searches for the following files to corrupt:

(System Files)

( Executing Files)

( Files of Data)