"This thesis investigates the requirements for establishing security criteria in designing and developing a local area network (LAN) for an aviation squadron. In particular, it concentrates on the security problems and control issues in the design of a LAN. A survey of the security literature on computer security was conducted to develop a model for identifying security problems in a local area network and devise control solutions. A case study was written based on the literature review and previous experience in the aviation community. Although many controls solutions are discussed, adequate planning, common sense and proper user training all play an integral part in developing an atmosphere of security awareness in networks."