Abstract: owadays the ontology in the semantic web lacks the access control mechanism, it causes the loss of privacy protection for the ontology and eventually damages the stability of semantic web. To guarantee the effective protection of the ontology, a new OWL-based model for access control is proposed. In this model, the access rules and the access control attributes are defined. The relations for the access control are set up. Features of this model are discussed in details to apply to the construction of the ontology and the ontology-based reasoning systems. It is shown that this new model can definitely demonstrate the relations for the access control and can be effectively used for the protection of the ontology. Moreover, with the flexibility and extensibility it owned, this new model also meets the increasingly complex requirements of the access control in the semantic web.

Key words: semantic web, ontology, access control