Abstract
D.Phil. (Computer Science)
The privacy of personal information is crucial in today's information systems. Traditional security models are mainly concerned with the protection of information inside a computer system. These models assume that the users of a computer system are trustworthy and will not disclose information to unauthorised parties. However, this assumption does not always apply to information privacy since people are the major cause of privacy violations. Alternative models are, therefore, needed for the protection of personal information in an environment.