Degree Name

Doctor of Philosophy


School of Information Technology and Computer Science


The original communications technology in worid was the telegraph. The telegraph transfer mode lasted until the telephone was invented. The telephone was an evident improvement over the telegraph, it did not take long before the computer networks came. Computer networking bring a great revolution with data and voice traffic carried by the different standardised communications protocols such as Transmission Control Protocol/Internet Protocol (TCP/IP). TCP/IP communication suite for internetworking has led to a global system of interconnected hosts and networks that is commonly referred to as the Internet. Now mostly operating systems using TCP/IP for standardised communication. No doubt that the maturity of TCP/IP over UNIX is more stronger in case of fast and trusted communication environments. A network with TCP/IP under UNIX environment is not enough secure for internetworking/Internet. This is due to the host-to-terminal architecture (of UNIX), and its trusted TCP/IP based services.