You can enable strong authentication by using other methods such as x509 or NESCM to increase the security than using the form based method. You can also use multi-factor for more security.
For more information, see Configuring Authentication
in the NetIQ Access Manager 24.2 (v5.1) Administration Guide.
For more information about extending the authentication mechanisms, see Identity Server Authentication API in the Access Manager 5.0 SDK Guide.