Mitigating the Malicious Trust Expansion in Social Network Service

With the growth of Social Network Service(SNS), the trust that plays the role of connecting people brings both good user experience and threat. Trust expansion is not only the means by which the SNS users construct their social network , but also exploited by the attackers to collect victims. Hence, it is desirable to find the differences between malicious and normal behaviors. In this paper we analyze the malicious trust expansion behavior and notice that the behavior feature of the malicious users is their weakness. We present the detailed analysis and propose a creative trust control strategy to restrict the malicious users, which fully exploit the characteristic of SNS. The conclusions are positively supported by simulation and experiment in a real SNS scenario.