SECURITY IN OPEN NETWORKS AND DISTRIBUTED SYSTEMS

With the ever increasing pervasiveness of computer networks, security of information stored in or transported through networks, as well as security of network components and resources themselves are becoming the focus of intense concern on the part of network users and operators. This paper discusses a selection of the most popular state-of-the-art mechanisms designed to protect information, objects and other resources found in networks and distributed systems. The various techniques discussed are introduced in a bottom-up order, starting with basic cryptographic tools, then explaining how these can be exploited to achieve various forms of authentication services, and finally sketching very briefly more recent, mostly experimental developments in the area of access controls for networks and network resources. The paper is addressed to readers with a background in networks and distributed systems but little or no understanding of security issues in general, system security in networking and distributed environments in particular.