ABSTRACT

Whether trust should be considered completely within the perimeter of security in computing and communications systems is a debatable issue. In normal human life, we see these two terms go hand in hand to dene the relationships we might have with fellow human beings. Trust among people sets the level of security felt by each person involved in various relationships. If person A does not trust person B, person A may not feel secure in the company of person B. Similarly, these terminologies could also retain the same meanings for our modern computing and communications equipments. However, a notable difference is that whereas trust and security are quite interrelated in human-life scenarios; in technical elds, these are considered as two clearly different issues with distinct boundary  lines. In

CONTENTS

Dening Boundaries of Trust and Security .........................................................1 Various Types of Security Models ........................................................................2