An Anonymous Context Aware Access Control Architecture For Ubiquitous Services

A new context aware access control architecture called Anonymous Context Aware Access Control Architecture (ACA2) is proposed. The basic idea of this architecture is based on an analogy to the public telephone service. Anonymous users can use services supported by their context information through preregistered software components called proxies. The main features of the architecture include anonymity, access suspension caused by context changes, and active context certificates with stream verification.