Access　control　is　an　important　security　mechanism　that　is　used　to　limit　user　access　to　information　and　resources　and　to　prevent　malicious　users　from　making　unauthorized　access.　Traditional　access　control　models　are　well　suited　for　centralized　and　relatively　static　environments　in　which　information　about　subjects　and　objects　are　known　in　priori,　but　they　can　hardly　meet　the　needs　of　open　and　dynamic　network　environments.　Access　control　in　open　network　environments　must　therefore　adapt　to　dynamic　addition　and　deletion　of　subjects　and　objects.　In　this　paper,　we　use　game　theory　to　analyze　trust-based　access　control　to　help　compute　trust　values　that　involve　several　factors.　By　viewing　access　control　as　a　game　played　between　the　requester　and　the　provider　entities,　we　can　develop　strategies　that　would　motivate　subjects　to　make　honest　access　to　objects　continuously　to　get　the　most　payoffs.