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---
title: "Authentication Method Reference Values"
description: "This guide shows a list of Authentication Method Reference Values based on RFC8176 and how they are implemented within Authelia"
summary: "This guide shows a list of other frequently asked question documents as well as some general ones."
date: 2025-02-23T16:08:49+11:00
draft: false
images: []
weight: 220
toc: true
seo:
title: "" # custom title (optional)
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---
Authelia leverages [RFC8176] in a few areas to communicate and control authorization.
Below is a list of the Authentication Method Reference Values and how we currently support them:
| Value | Description | Factor | Channel |
|:------:|:-----------------------------------------------------------------:|:----------:|:--------:|
| mfa | User used multiple factors to login (see factor column) | N/A | N/A |
| mca | User used multiple channels to login (see channel column) | N/A | N/A |
| user | User confirmed they were present when using their hardware key | N/A | N/A |
| pin | User confirmed they are the owner of the hardware key with a pin | N/A | N/A |
| kba | User used a knowledge based authentication factor | Knowledge | N/A |
| pwd | User used a username and password to login | Knowledge | Browser |
| otp | User used TOTP to login | Possession | Browser |
| pop | User used a software or hardware proof-of-possession key to login | Possession | Browser |
| hwk | User used a hardware proof-of-possession key to login | Possession | Browser |
| swk | User used a software proof-of-possession key to login | Possession | Browser |
| sms | User used Duo to login | Possession | External |
| face | _Unsupported_ | N/A | N/A |
| fpt | _Unsupported_ | N/A | N/A |
| geo | _Unsupported_ | N/A | N/A |
| iris | _Unsupported_ | N/A | N/A |
| rba | _Unsupported_ | N/A | N/A |
| retina | _Unsupported_ | N/A | N/A |
| sc | _Unsupported_ | N/A | N/A |
| tel | _Unsupported_ | N/A | N/A |
| vbm | _Unsupported_ | N/A | N/A |
| wia | _Unsupported_ | N/A | N/A |
[RFC8176]: https://datatracker.ietf.org/doc/html/rfc8176
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