System and method for biometric authentication

The present invention is applicable to the field of network security and discloses a security authentication system and method. In the present invention, the biometric authentication subsystem of the security authentication system receives the biological certificate held by the user and the biological information of the user held by the user, the biological certificate contains the storage address of the user's biological template or the biological template; The system verifies the biological certificate; and compares the biological information and the biological template to generate the identity authentication result. The invention can also combine the biometric authentication with the PMI authority authentication to improve the security of the identity authentication in the PMI and expand the scope of the biometric authentication.