!!! Overview[1]
[{$pagename}] ([amr_values]) is defined in [RFC 8176] and creates a Authentication Method Reference Values Registry [IANA Registry] [Authentication Method Reference Values|https://www.iana.org/assignments/authentication-method-reference-values/authentication-method-reference-values.xhtml#amr-values|target='_blank'].

The "[amr]" ([Authentication Method Reference]) [claim] is defined and registered in the [IANA] "[JSON Web Token Claims]" registry [IANA.JWT.Claims], but no standard [{$pagename}] are currently defined.  [RFC 8176] specification establishes a registry for Authentication Method Reference values and defines an initial set of [{$pagename}].

The following is a list of [{$pagename}] defined by the [Authentication Method Reference Values] specification:

%%zebra-table
%%sortable
%%table-filter
||Value||Description
|[face|Facial recognition]|[Facial recognition]
|[fpt]|[Fingerprint recognition] [Biometric Authentication]
|[geo]|[Geolocation]
|[hwk]|[Proof-of-Possession] ([PoP]) of a [hardware-secured key]. See Appendix C of [RFC 4211] for a discussion on [PoP].
|[iris|Iris recognition]|[Iris recognition] 
|[kba|KBA]|[Knowledge-based authentication|Knowledge Factor] [NIST.SP.800-63]
|[mca|MCA]|[Multiple-channel Authentication].  The authentication involves communication over more than one distinct channel.
|[mfa|MFA]|[Multi-Factor Authentication] [NIST.SP.800-63].  When this is present, specific [Authentication Methods] used may also be included.
|[otp|OTP]|[One-Time password]. [One-Time password] specifications that this [Authentication Method] applies to include [RFC 4226] and [RFC 6238].
|[pin|PIN]|[Personal Identification Number] or pattern (not restricted to containing only numbers) that a user enters to unlock a key on the device. This mechanism SHOULD have a way to deter an attacker from obtaining the PIN by trying repeated guesses.
|[pwd]|[Password-based] [Authentication]
|[rba|Risk-Based Authentication]|[Risk-Based Authentication] [JECM]
|[retina|Retinal recognition]|[Retinal scan|Retinal recognition] [Biometric Authentication]
|[sc|Smart Card]|[Smart Card]
|[sms|SMS]|Confirmation using [SMS] message to the user at a registered number
|[swk]|[Proof-of-Possession] ([PoP]) of a [Software-secured key]. See Appendix C of [RFC 4211] for a discussion on [PoP].
|[tel]|Confirmation by telephone call to the user at a registered number
|user|User [presence] test
|[vbm]|[Voice recognition] by [Biometric Authentication]
|[wia|WIA]|[Windows Integrated Authentication], as described in [MSDN]
/%
/%
/%

!! Where Used
[{$pagename}] __SHOULD__ be used for all of the following:
* [amr]
* [amr_values]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Authentication Method Reference Values draft-jones-oauth-amr-values-03|https://tools.ietf.org/html/draft-jones-oauth-amr-values-03#section-7.1|target='_blank'] - based on information obtained 2013-04-10