Duo Security

Duo Security is a cloud-based multi-factor authentication and access security provider focused on securing access to applications and data across hybrid and multi-cloud environments.

• Cloud-delivered multi-factor authentication (identity and access management)
• Zero Trust secure access to applications and infrastructure (Zero Trust network access)
• Device health and posture assessment for access control (endpoint security)
• Single Sign-On (SSO) and centralized access policy enforcement (identity and access management)
• Integration with cloud, on-premises (on-prem), and Virtual Private Network (VPN) resources via standards-based protocols (enterprise security integration)

More About Duo Security

Duo Security provides cloud-based access security services that enterprises, public sector entities, and other organizations use to verify user identities and device posture before granting access to internal and external applications. Its platform is built around multi-factor authentication (MFA) (identity and access management), delivered as a service, and is designed to integrate with existing identity providers, directories, and network infrastructure. The service is used to protect web applications, VPNs, remote desktop services, cloud platforms, and on-prem resources by requiring users to confirm login attempts via methods such as mobile push notifications, hardware tokens, or passcodes.

The company aligns its offerings with Zero Trust (Zero Trust network access) principles, focusing on continuous verification of users and devices rather than implicit trust based on network location. Duo Security evaluates device health and posture (endpoint security) as part of the access decision, checking factors such as Operating System (OS) version, security settings, and browser configuration. These checks enable administrators to create access control policies that account for device compliance, user group, location, and application sensitivity, and to enforce step-up authentication when risk conditions increase.

Duo Security supports SSO (identity and access management) so that users can authenticate once and access multiple cloud and on-prem applications through a unified portal. The platform integrates with common enterprise identity stores such as Active Directory and SAML- or OIDC-based identity providers, and it leverages widely adopted protocols including Security Assertion Markup Language (SAML), OAuth, RADIUS, LDAP, and WebAuthn/FIDO2 (authentication and federation standards). These capabilities allow organizations to extend Multifactor Authentication (MFA) and access policies across diverse IT environments, including Software-as-a-Service (SaaS) applications, custom web apps, VPN gateways, and network devices.

From an architectural perspective, Duo Security operates as a cloud-hosted control plane that interacts with on-prem components and cloud services via connectors, agents, and standard protocols. Administrators configure policies, monitor authentication events, and review security telemetry through a centralized management console. Reporting and logging features integrate with Security Information and Event Management (SIEM) platforms and Security Operations (SecOps) workflows, supporting audit requirements and incident investigation processes.

Within an enterprise technology directory, Duo Security fits into categories such as multi-factor authentication (identity and access management), Zero Trust secure access (Zero Trust network access), device trust and posture assessment (endpoint security), and secure SSO (identity and access management). Organizations use its services to reduce reliance on passwords alone, implement Zero Trust access models, and apply consistent access policies across heterogeneous application landscapes, including hybrid and multi-cloud deployments.