PortalGuard’s Flexible Two-factor Authentication options are designed as strong authentication methods for securing web applications. PortalGuard leverages a one-time password (OTP) as a factor to further prove a user's identity. The OTP can be delivered via SMS, email, printer, and transparent token. Configurable by user, group or application this is a cost effective approach to stronger authentication security. Tutorial: http://pg.portalguard.com/flexible_two-factor_tutorial