Aims
The module is concerned with the protection of data transferred over digital networks, including computer and telecommunications networks. We review networking concepts, particularly the concepts of services and protocols, and study how services are incorporated in network communications by specifying protocols. We extend the discussion of services to address security concerns, considering how cryptographic primitives may be used to provide confidentiality, integrity and authentication services. We illustrate these concepts by considering a variety of case studies, typically including wireless, cellular, network and transport layer protocols, techniques and technologies, including non-cryptographic countermeasures such as packet-filtering, intrusion detection, etc.

Objectives
At the end of the module students should have gained an understanding of the fundamentals of the provision of security in networks, as well as an appreciation of some of the problems that arise in devising practical solutions to network security requirements.