Athens.
Finally for this trust and security panel at WebSci '09 we move on to Pavlos Spirakis. He begins by noting that the Web was initially invented as a tool for researchers who trusted one another implicitly, so no security was built in from the beginning. This is no longer the case, of course, and so theer is a need fro privacy protection and for the protection of the freedom of its users. Layers of trust must therefore be engineered into Web technology.
Trust, however, is the belief of one party in another, and distrust is not simply the lack of trust, but the belief that the other partner explicitly cannot be trusted. Such distrust is an important notion in its own right, then. Trust is a relation between two parties, then, is context-specific, and exists in varying degrees of strength. This means that trust is measurable, Pavlos suggests, and that it can be expressed mathematically (algorithms such as Google's PageRank build on this).