About

Duo is a multifactor authentication (MFA) tool that allows admins to add an extra layer of security to user accounts. Each user is granted a token that is generated upon account creation in the Duo Admin Panel. When users login, they will automatically receive a notification on a separate device that they own, most likely a phone with Duo Mobile installed on it, prompting them to verify that they are the ones attempting to login. Duo can be set up on all systems and services that support it, including Windows, macOS/iOS, and Linux/Android based systems. This helps to prevent phishing attacks, malware, and ransomware attacks.

Authentication Methods

• Duo Push: Approve a login verification request sent to your smartphone with the Duo Mobile app
• Passkey: Security keys and biometrics
• Text Message: SMS message containing a one-time passcode that is valid for five minutes
• Phone Call: Receive a phone call communicating a one-time passcode that is valid for five minutes
• Duo Mobile passcode: Authenticate with a passcode generated in the Duo Mobile app
• Hardware Token: Enter a passcode generated by a physical device issued by your organization
• Yubikey passcode: Authenticate with a passcode generated by a Yubikey

References

What is Duo? Two-Factor Authentication From Cisco - Cisco
Complete Identity Security & MFA Solutions | Duo Security