Information systems concentrate data in computer files that have the potential to be accessed by large numbers of people in and outside of organisations. While security breaches and damages of information systems still come from organisational insiders, security breaches are increasing, especially in developing countries because organisations are now open to outsiders through the internet. As a result, automated data are more susceptible to error, destruction, fraud and misuse. The banking sector in Zimbabwe has introduced, of late, on-line banking facilities and these are heavily dependent on the use of internet. / The increase in computer crime has led to scepticism about the move made by the banks to introduce on-line banking. Some view this as a noble move which has made the banking system more efficient, reliable and secure, while others view it as a risky and insecure way of banking. The aim of this study was to assess whether on-line banking in the developing countries is secure or not. The researcher chose a descriptive-quantitative research design. Data was collected using a self constructed questionnaire. Convenience sampling and stratified random sampling techniques were used to select the main subjects of the study. Generally on average there was no significant difference between the perceptions of management bank personnel and non-management bank personnel on the security of on-line banking. The study recommends further future studies on the security of on-line banking in developing countries based on the perceptions of the customers themselves, who are using on-line banking services, the Common Criteria for Information Technology Security and also a study of the latent dimensions of on-line banking security as extracted by factor analysis, how they differ from elements of information security as derived from the theoretical framework and literature.