---
title: "RADIUS back-end authentication"
slug: "oas-pg-radius-back-end-authentication-3-28"
updated: 2025-07-04T10:04:30Z
published: 2025-07-07T13:58:21Z
canonical: "docs.onespan.com/oas-pg-radius-back-end-authentication-3-28"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.onespan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# RADIUS back-end authentication

OneSpan Authentication Server can pass RADIUS return attributes from the back-end server to the client component. Back-end authentication is supported with the following protocols:

- PAP
- CHAP
- MS-CHAP
- MS-CHAP v2 with MPPE key generation