RADIUS

ˈreɪdiəs · Abbreviation · Security & Infosec

Definitions

  1. Short for Remote Authentication Dial-In User Service, a protocol commonly used for centralized authentication, authorization, and accounting in network access systems such as Wi-Fi, VPNs, and switches. RADIUS is widely deployed, though its security depends heavily on transport protections, shared secrets, and deployment design.

    In plain English: A protocol used to centrally authenticate and authorize access to network services.

    Example: "The enterprise Wi-Fi used RADIUS to authenticate users centrally and apply different network roles based on group membership."

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