Two-Factor Authentication for Cisco ASA SSL VPN with Duo Security (Primary Configuration)
Duo Security (https://www.duo.com) provides a two-factor authentication integration for Cisco ASA SSL VPN that is easy to deploy, use, and manage. This demonstration video shows how to protect your Cisco ASA SSL VPN with Duo in less than 10 minutes. For additional information on this integration visit our Cisco ASA documentation at https://duo.com/docs/cisco and sign up for a free trial.
via Duo Security