
Identity Security for Dummies
In this eBook, you’ll learn how to make identity security a cornerstone of your organization’s defense strategy.
Trust, at scale.
1.3B+
monthly user
authentications
From small startups to large enterprises, we secure every click, every connection, every time.

We’ve gone cookieless.
(A good cookie is just too tempting, after all.)
Attackers hate us. Users love us.

What users say





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

What users say





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

What users say





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

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

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