Research Of Trust Management In Pervasive Computing Environment

Compared with the rapid developing ubiquitous computing technology application, the progress of security research has fell behind a lot. It is greatly bad for ubiquitous computing to transit from theory and experiments to large-scale of practical application. It's of great urgency to study In-depth on ubiquitous computing security.As ubiquitous computing is characterized by distributivity, dynamicity and uncertainty, traditional security mechanism is not sufficient enough to meet the security needs of ubiquitous computing. The main reason is that traditional security mechanism is over dependant on centralized management strategies and information made statically (including security strategies, subject identifier, etc). As an important tool for human society, trust helps people to deal with the uncertainty caused by the free will of other people. However, uncertainty and uncontrollability also exist in cooperative work based on computers, so trust concept can also be used in computer field to solve the problems in security collaboration by establishing confidence management models. The main ideas of this paper are to establish dynamic trust management models in ubiquitous computing.Aiming at these problems, following innovative work is described in this paper.1. A formalized trust definition which has clear structure and is suitable for ubiquitous computing environment and also has greater instruction in modeling is proposed. Detail analysis on the characteristics of trust is done which further provides basis and foundation for trust management.2. Through analysis of the concepts of trust-related, abstract models of entity, trust, behavior trust, identity trust, basic trust, context trust, etc, are established based on object-oriented thinking. A formalized definition of trust ontology is proposed using basic modeling metalingual; Combined with the abstract models, trust ontology model is established based on Description Logic.3. Formalized conditions for trust transfer is proposed, a trust management model for ubiquitous computing is established, formalized description about trust evaluation and trust paths combination is carried out and illusive feedback is filtered through recommended audit mechanism.4. Self-domain model for Smart space is proposed. On this basis, a trust management framework based on intelligent space self-domain is proposed. To against sybil attacks, a global unique identifier is established based on both public keys of entities and the private key of the domain manager. Also to effectively control the delegation of SPKI certificate, a M-SPKI certificate is proposed.