Wednesday, February 3, 2010

ASSIGNMENT 2

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

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

State two differences between worms and viruses.
Worm-Operates through the network
          -Spread copies of itself as a stand alone program
Virus  -Spreads through any medium
          -Spread copies of itself as a program that attaches to other program


There are six types of security measures that can be used to protect our computer.Explain what is

a.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.

b.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.

    

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