Skip navigation

Search

About Duo

Blog

Careers Now Hiring!

Admin Login

Product

Product

Explore Our Products
Duo provides secure access to any application with a broad range of capabilities.

Multi-Factor Authentication (MFA)

Verify the identities of all users with MFA.

Remote Access

Provide secure access to on-premise applications.

Device Trust

Ensure all devices meet security standards.

Single Sign-On (SSO)

Provide secure access to any app from a single dashboard.

Adaptive Access Policies

Block or grant access based on users' role, location, and more.

Duo in Action

Click through our instant demos to explore Duo features.

Explore Demos

Want access security that’s both effective and easy to use? You need Duo.
Start a Free Trial
Editions & Pricing

Editions & Pricing

Compare Editions
Get the security features your business needs with a variety of plans at several price points.

Duo Free

Free (10 users)

Simple identity verification with Duo Mobile for individuals or very small teams.

Duo Essentials

$3/User/Month

Desktop and mobile access protection with basic reporting and secure single sign-on.

Duo Advantage

$6/User/Month

All Duo Essentials features, plus adaptive access policies and greater device visibility.

Duo Premier

$9/User/Month

Get complete zero trust access for every application. Enable VPN-less remote access to private resources.

Duo Federal

Variable Pricing

FedRAMP authorized, end-to-end FIPS capable versions of Duo Essentials and Duo Advantage.

Pricing Questions?

Get in Touch

Have questions about our plans? Not sure where to begin? Get in touch with us. We’ll help you choose the coverage that’s right for your business.

Contact a Duo Representative
Solutions
Solutions

Explore Our Solutions
Duo provides secure access for a variety of industries, projects, and companies.
By Industry

K-12

Higher Ed

Finance

Healthcare

Legal

Retail

Technology

Government Solutions

Federal Government

State & Local Government

Use Cases

Zero Trust Security

Passwordless

Phishing Prevention

Risk-Based Authentication

Customer Stories
Passwordless Authentication

Users can log into apps with biometrics, security keys or a mobile device instead of a password.

Explore Passwordless

Cisco's Secure Access Story

Cisco + Duo

Discover how Cisco efficiently deployed Duo to optimize secure access and access control in their global workforce.

"The tools that Duo offered us were things that very cleanly addressed our needs."

Watch The Video
Partnerships

Partnerships

Learn About Partnerships
Partner with Duo to bring secure access to your customers.

Duo Technology Partner Program

Integrate with Duo to build security into applications.

Already a Tech Partner? Sign-in

Duo Managed Service Providers

Deliver scalable security to customers with our pay-as-you-go MSP partnership.

Duo Security Solution Providers

Enhance existing security offerings, without adding complexity for clients.

Already a SSP Partner? Sign-in

Want access security that's both effective and easy to use? You need Duo.
Try Duo for Free
Support
Support

See All Support
Have questions? We’re here to help! Our support resources will help you implement Duo, navigate new features, and everything in between.
Support for Administrators

Knowledge Base

Community Forum

How-To Videos

Contact Support

Support for Duo End Users

End-User Guide

Duo Mobile FAQ

Get Duo Mobile for iOS

Get Duo Mobile for Android

Expert Advice

Duo Care

Duo Quick Start

Additional Topics

Release Notes

Security & Reliability

System Status
Dedicated Support

Dedicated Support

Duo Care is our premium support package. With a dedicated Customer Success team and extended support coverage, we'll help you make the most of your investment in Duo, long-term.

Learn More About Duo Care
Duo Documentation
Duo Documentation

Browse All Docs
Get instructions and information on Duo installation, configuration, integration, maintenance, and much more.
Popular Topics

Getting Started with Duo

Admin Overview

Duo Administration - Protecting Applications

End-User Guide

Administrator Guides

Docs for Duo Editions

Duo Essentials Edition

Duo Advantage Edition

Duo Premier Edition

Duo Federal Editions

Integrations

Remote Access & VPN

Microsoft

Web Applications

Identity Providers

Cloud Service Providers

Other Applications

Unix & SSH

Our APIs
Related

Release Notes: Keep Up With the Latest Product Updates

We update our documentation with every product release. Sign up to be notified when new release notes are posted.

Read All Release Notes
Resources
Resources

See All Resources
Explore research, strategy, and innovation in the information security industry.
News & Press

Blog Articles

Press Releases

Events & Webinars

Events On Demand

Event Coverage

Ebooks

Duo Videos

Security Education

Product Videos

Technical Setup Videos

InfoSec Glossary
Duo Labs Research

We disrupt, derisk, and democratize complex security topics for the greatest possible impact.

Explore Labs Research

Featured

Passwordless: The Future of Authentication

With the rise of passwordless authentication technology, you'll soon be able to ki$$ Pa$$words g00dby3. Learn how to start your journey to a passwordless future today.

Get the Guide

About Duo

Blog

Careers Now Hiring!

Admin Login

Contact Sales Free Trial

Contact Sales Free Trial

← Back to Index

Attacker

A user acting with malicious intent to gain access to and compromise an information system.

Share:

Related Terms

Brute Force
Man-in-the-Middle (MiTM)
Script Kiddie
Sniffing
Social Engineering
Trojan Horse

Related Articles

Industry News

Introducing... The Access of Evil

Duo Security Presents...the Access of Evil. These miscreants want all your data and they’ve honed their skills to get...

Try Duo For Free

With our free 30-day trial you can see for yourself how easy it is to get started with Duo's trusted access.

Start Your Free Trial

Customer Stories

Hear directly from our customers how Duo improves their security and their business.

eBooks

Learn more about a variety of infosec topics in our library of informative eBooks.

Contact Support
Contact Sales

International Resources:

Français Deutsch Español 日本語

Events & Webinars
News & Press
Duo Blog
Duo Labs
Careers at Duo Now Hiring!

Search

© 2023 Duo
Terms of Service
Privacy Statement
Duo Privacy Data Sheet
Copyright Dispute Policy
Service Level Agreement
Security Response
Business Continuity During COVID-19
Manage Cookie Preferences