Phishing season is over.

Meet the only IAM solution built for security.

Attackers have learned how to evade traditional MFA, SSO, and Identity and Access Management (IAM). So we redefined the category to include end-to-end phishing resistance.

We stop users from taking the bait.

With unified identity intelligence, Cisco Duo is made to block modern phishing attacks.

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Animated illustration showing the movement pattern of a worm, demonstrating how it crawls or wriggles.

Duo has revolutionized IAM
with end-to-end phishing resistance,
without an added price tag.

Same assurance as FIDO2.

50% less cost.

Hook. Line.
Denied.

Duo seamlessly protects the entire identity lifecycle, extending trust behind the scenes—no hardware keys, no passwords, no re-authentication. You're protected end to end, for endless peace of mind.

How Duo locks phishers out

Proximity verification

Using biometrics and Bluetooth, Duo knows you are who you say you are. To bypass this, an attacker would have to be sitting right next to you.

AI-powered continuous identity security

Duo verifies users once and then identifies risks in real time, denying access only if it smells something phishy.

Adaptive protection with app-level control

Duo delivers customized security that scales effortlessly. You can add smart policies and choose re-verification where it matters most.

Dive in.
The water’s safe.

Hear directly from Duo experts to understand how identity threats work—and how Duo stops them cold.

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See how Duo drives security and cost savings in the Forrester TEI study.

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Discover how Duo simplifies workforce security in the upcoming live demo.

What is identity security and why does it matter?

As threat actors increasingly target identities, organizations must stay ahead by implementing a comprehensive identity security program.

Identity Security for Dummies eBook cover

Download the Identity Security for Dummies eBook

Identity Security for Dummies

In this eBook, you’ll learn how to make identity security a cornerstone of your organization’s defense strategy.

Are you an MSP, IT Provider or Reseller?

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Trust, at scale.

1.3B+
monthly user
authentications

From small startups to large enterprises, we secure every click, every connection, every time.

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We’ve gone cookieless.

(A good cookie is just too tempting, after all.)

Attackers hate us. Users love us.

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What users say

Full star icon Full star icon Full star icon Full star icon Full star icon

“Duo Security is a simple, low-friction way to solve the problem of compromised accounts… ”
- IT Analyst, Higher Education

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What users say

Full star icon Full star icon Full star icon Full star icon Full star icon

“Cisco Duo gives us flexibility… It's a great security option, with great support.”
- IT Manager, Transportation

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What users say

Empty star icon Empty star icon Empty star icon Empty star icon Empty star icon

“0 stars. Can’t steal anything. Would not phish again.”
- Disappointed Threat Actor

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Cisco is a 2025 Customer’s Choice for the 'User Authentication' market on Gartner Peer Insights™ based on reviews submitted for Cisco Duo.*

TrustRadius Top Rated 2025 Buyer’s Choice for Authentication

75% of verified reviewers rank Duo highest in capabilities, value, and vendor relationship.
See why Duo won TrustRadius 2025 Buyer’s Choice for Authentication.

Ready to tackle
phishing threats?

Sign up for your free trial now or buy a subscription in three easy steps.

* Gartner, Voice of Customer for User Authentication, Peer Contributions, May 30, 2025.
Gartner® and Peer Insights™ are trademarks of Gartner, Inc. and/or its affiliates. All rights reserved. Gartner Peer Insights content consists of the opinions of individual end users based on their own experiences, and should not be construed as statements of fact, nor do they represent the views of Gartner or its affiliates. Gartner does not endorse any vendor, product or service depicted in this content nor makes any warranties, expressed or implied, with respect to this content, about its accuracy or completeness, including any warranties of merchantability or fitness for a particular purpose.