... LDAP, RADIUS, digital certificate, token, USB key, short message service (SMS), device ID, and CAPTCHA. Therefore, the SVN5800 ... of an enterprise. The virtual gateway technology maximizes device efficiency, minimizes hardware cost, and improve return ... RADIUS, LDAP, SecurID, X.509 digital certificate, USB key, SMS, device ID, and CAPTCHA authentication. Supports hierarchical authentication, single ...