In this paper, we start by describing the concerns people have with cyberspace security. This might seem unnecessary to security practitioners but the number of times the authors experience arguments to the contrary suggest that it would be useful to start by relating concerns expressed in this area. Cyberspace security is indeed in its infancy compared with physical security. A comprehensive programme is urgently needed to make progress in this area. After a brief overview of typical security measures currently in place and their issues, we focus on the main topic of this paper: namely platform security. We describe a particular approach of enhancing platform security that is architecture independent and aims to provide a root of trust on computing platforms.