the invention discloses a platform authentication method suitable for trusted network connect architecture based on tri - element peer authentication . the method relates to a platform authentication protocol of tri - element peer authentication , and the protocol improves network security as compared with prior platform authentication protocols ; in the platform authentication protocol of the tnc architecture based on tepa , a policy manager plays a role as a trusted third party , which is convenient for concentrated management , thus enhancing manageability ; the invention relates to the platform authentication protocol of the tnc architecture based on tepa , has different implementation methods and is beneficial for different dispositions and realizations .