Research On Access Control Based On Privacy Ontology In Online Social Networks

With the rapid development of Internet technology,more and more network services have entered into people's daily life.Online social networks can satisfy users' quick and convenient communication and share information with others.And it has brought great convenience to people's daily life.But users who publish information in the online social networks platform also produced the privacy risks while promoting exchanges with others.How to meet the needs that users share information with friends and protect the user's privacy effectively at the same times is the main problem of privacy protection in online social networks.Therefore,we need to clarify the scope of online social networks privacy protection and the related knowledge in the privacy field.And proposing corresponding privacy protection methods according to the characteristics of the privacy area to ensure the security of privacy information of users in online social networks.The main contents of this paper are as follows:First,we define the scope and components of online social networks privacy protection according to the characteristics of privacy domain in online social networks.And expressing and analyzing the knowledge in this field and building an online social network privacy domain ontology which describes user's privacy protection needs.Next,this paper proposes a fine-grained privacy protection access control mechanism to help solve the problem that the users can not manage their information effectively in online social networks.This method marks the access level of friends,the privacy level of actions,the privacy level of information by the means of adding labels to friends,actions and information.And controlling the access of information by verifying whether friends meet the access conditions.Third,this paper design and implement a prototype system of access control based on online social networks privacy domain ontology.The prototype system is used to analyze the cases that user publish information and friends request information in the online social networks,which proves the rationality and effectiveness of the proposed theory and method in privacy protection.