Assignment 2

People interact directly with computer in many field in our daily life.ICT help people in managing several sectors.But we have threats to computer such as viruses and natural disasters.

a.Name 4 main sectors that used ICT in their management
Education
Banking system
Industry
Commerce

b.State 2 differences between Worm and Viruses

Worm	Virus
Operates through the network	Spreads through any medium
Spreads copies of itself as a standalone program	Spreads copies of itself as a program that attaches to other programs

c.There are 6 type of security measures that can be use to protect our computer.Explain what is;

i.Cryptography
Cryptography is a process of hiding information by altering the actual information into different representation, for example, an APA can be written as I? X.Almost all cryptosystems depend on a key such as a password like the numbers or a phrase that can be used to encrypt or decrypt a message.The traditional type of cryptosystem used on a computer network is called a symmetric secret key system.

ii. Firewall
Firewall is a piece of hardware or software which functions in a networked environment to prevent some communications forbidden by the securitpolicy.Firewall implement a security policy. It might permit limited access from in or outside the network perimeters or from certain user or for certain activities.

TYPES OF FIREWALL

SCREENING ROUTERS	PROXY GATEWAY	GUARD
Simplest	Somewhat complex	Most complex
Sees only addresses and service protocol type	Sees full text of communication	Sees full text of communication
Screen based on connection rules	Screen based on behaviour proxies	Screen based on interpretation of message content