Duo: Two Factor Authentication
What is it and why use it?
Duo is a tool that provides two-factor authentication to better protect your account by requiring an additional piece of information beyond your username and password. When you access CSU VPN services (using both the Pulse Client and secure.colostate.edu) you will be required to use a device that you have (your mobile phone, desk phone, a hardware token, or other device) to provide an additional layer of security to your account. This is done by using the Duo Security app (on your smartphone) and receiving a push authentication request, or through a phone call or entering a generated code.