Trust-based dynamic access control policy for ubiquitous computing

With the open characteristics of ubiquitous computing environment,the diversity of users is not only inevitable, but also bring threats to the security of the system. Generally, users can access resources and abtain services anytime anywhere in the ubiquitous computing environment, however, the owner of resource and requestor of resource do not know each other. Here discussed the trust-based dynamic access control policy of principals.