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The proliferation of Social Network Sites (SNSs) has greatly reformed the wayof information dissemination, but also provided a new venue for hosts withimpure motivations to disseminate malicious information. Social trust is thebasis for information dissemination in SNSs. Malicious hosts judiciously anddynamically make the balance between maintaining its social trust and selfishlymaximizing its malicious gain over a long time-span. Studying the optimalresponse strategies for each malicious host could assist to design the bestsystem maneuver so as to achieve the targeted level of overall maliciousactivities. In this paper, we propose an interaction-based social trust model,and formulate the maximization of long-term malicious gains of multiplecompeting hosts as a non-cooperative differential game. Through rigorousanalysis, optimal response strategies are identified and the best systemmaneuver mechanism is presented. Extensive numerical studies further verify theanalytical results.

Trust Exploitation and Attention Competition: A Game Theoretical Model