You can improve the security by adding a 'second layer' of protection called 'two factor authentication'. This means adding another method of authenticating your users, on top of the existing username and password access.
Digi-Access™ adds two security functions:
To ease the introduction of this two factor authentication system into your organisation, Digi-Access™ can be completely managed and outsourced under Total Trust Management™ [TTM™] [2]
And because Digi-Access™ is compatible with 27 different servers [3], adding the second layer of security to your infrastructure does not require any re-programming of your existing environment. It literally 'sits in front' of your current systems.
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=digi-ca-pdf
[2] http://www2.digi-sign.com/digi-ca/total+trust+management
[3] http://www2.digi-sign.com/en/digi-access/compatibility
[4] https://www.digi-sign.com/demos/online-extranet/enroll.php
[5] https://www.digi-sign.com/order/digi-ca
[6] http://www2.digi-sign.com/en/support/digi-access/index
[7] http://www.digi-sign.com/demos/digi-ca/
[8] http://www2.digi-sign.com/https
[9] http://www2.digi-sign.com/en/digi-ca
[10] http://www2.digi-sign.com/digi-ca/service
[11] http://www2.digi-sign.com/digi-ca/server
[12] http://www2.digi-sign.com/en/identity+authentication/index
[13] http://www2.digi-sign.com/taxonomy/term/83