A Seamless Mobile Community Support System

Ubiquitous community support systems have the potential to ease daily life through delivering valuable interactive information and member contacts right in the place where they are needed. Since in real life humans move permanently between communities, we aim at building an interoperable community infrastructure which focuses on seamless switching between different community types. We show how federation can support environment adaptation, how we achieve common member understanding based on a global community ontology and how authentication based on digital certificates can enforce security amongst the community members without loss of privacy.