Securing any on line system with usernames and passwords (single factor authentication) may not offer the level of protection and security your organisation needs. Adding a 'second layer' of protection, called 'two factor authentication [1]' [2FA], is the preferred security option that strengthens the existing username and password access. The following video shows how Digi-Access™ [2] provides this two factor authentication [2FA].
Links:
[1] http://www2.digi-sign.com/digi-access/approach
[2] http://www2.digi-sign.com/digi-access
[3] http://www.youtube.com/watch?v=TQUKbWVUsqY
[4] http://www2.digi-sign.com/product/digi-access