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Two-factor authentication made easy

Duo Security lets your users use their mobile phones to secure their logins, protecting your company from account takeover and data theft.  Learn more »

Free 30-day trial

Frustrate the bad guys, not your users.

With our flexible authentication methods

We've got you covered.

Duo Mobile

Generate passcodes with our free mobile app, available on all smartphones.

Duo Push

Authenticate with one tap on iPhone, Android, and BlackBerry.
Watch demo »

Phone Callback

Duo will call your phone, just press a key to log in.

Text Message

Get a batch of passcodes by text message.

Hardware Tokens

Duo sells hardware tokens and even supports the third-party tokens you already own.

451 Impact Report on Duo Security's two factor authentication service

Trusted by

Some of Duo Security's two factor authentication customers

“Getting Duo up and running with our Juniper SSL VPN was fast, easy, and painless ... our users have had no problems since we rolled it out.”

Steven Schneider · CISO, Central Ohio Primary Care Physicians

“Flexible both in authentication methods and the systems you can use it with, Duo takes very little effort to configure and even less effort to use.”

Mike Lowe · System Administrator, Indiana University High Performance Computing

“I generally don't get excited about many new technologies, but everyone carries a mobile device these days and this solution makes two-factor authentication simple and easy.”

Ken Rolle · Sr. Network Engineer, Cornerstone OnDemand

“Duo is the first two-factor product that doesn't make me want to shoot myself in the face.”

Kris Lamb · VP of Engineering, Arbor Networks

Protect your organization with Duo Security.  Try it free for 30 days.  Get started »