Research On Trust-based Privacy Protection Technology In Social Networks

With the flourishment and popularization of computer and network technology,the Internet has been widely applied globally.Various social network applications have emerged in a great number,such as Instagram and Facebook in the United States and Weibo in China etc.Nowadays,social networks have become the main way for people's communication,at the same time,its “openness” has also brought more and more uncertainties,such as the security of users' privacy.Therefore,how to identify which entity users are worthy of trust,how to protect the privacy of social network users and have become concerns for researchers.For privacy and security issues,the most common way is to establish a social network access control system,and the existing social network access control system is mostly a model based on users' relationship.Whether it is based on the relationship type or distance,the indeterminacy between friends is ignored,and the demands of the users' privacy protection cannot be satisfied.Trust,as an important indicator of the relationship between users,can effectively solve the uncertainty between friends.In this,trust will be introduced to access control system,and a trust-based access control model is proposed.The calculation of trust is one of the cores in the access control system.In this,the calculation of the direct trust between users is mainly introduced,and a fuzzy trust calculation method is put forward.In the quantization process of trust,such 3 impact factors as users' reputation,similarity and familiarity are mainly considered.Due to such features as users have different reputations in different circles,the concept of role value is introduced in the process of reputation calculation.In the process of users' familiarity calculation,we distinguish between active interaction and passive interaction between users.Finally,the trust is expressed by the use of the language value,which is intuitive and easy to understand.In the experimental part,the rationality and effectiveness of the scheme are confirmed.In addition,on the basis of social network trust,a social network access control mechanism is proposed based on trust in the paper.Usually,privacy information in social networks is either visible or invisible,which is obviously not flexible enough to meet the users' using experience.In the paper,the sensitivity of each information unit is divided,and more detailed access is achieved in accordance with the sensitivity of the information unit to the trust level.The privacy information is divided into information units and the sensitivity of the information is used as an access control strategy,which achieves fine-grained access,and ensures the security of user privacy information.Finally,it is proved by experiments that it has lower privacy risk than the ordinary access control model.