The contents access and sharing in multimedia social networks (MSNs) mainly rely on access control models and mechanisms.\nSimple adoptions of security policies in the traditional access control model cannot effectively establish a trust relationship among\nparties. This paper proposed a novel two-party trust architecture (TPTA) to apply in a generic MSN scenario. According to the\narchitecture, security policies are adopted through game-theoretic analyses and decisions. Based on formalized utilities of security\npolicies and security rules, the choice of security policies in content access is described as a game between the content provider\nand the content requester. By the game method for the combination of security policies utility and its influences on each party�s\nbenefits, the Nash equilibrium is achieved, that is, an optimal and stable combination of security policies, to establish and enhance\ntrust among stakeholders.
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