!!! Overview
[{$pagename}] ([amr]) is an attribute within the [OpenID Connect] [Identity Token].

[{$pagename}] ([amr]) [claim] is defined and registered in the IANA "[JSON Web Token Claims]" registry. Additionally, [JSON Web Token Claims] also defines the "[amr_values]" [Authentication Request] parameter for requesting that a set of [Authentication Method Reference Values] be used for processing the [Authentication Request]. 

The initial set of [Authentication Method Reference Values] and [IANA Registry] is defined within [RFC 8176].  

!! Relationship to [Authentication Context Class Reference] ([acr])
The [Authentication Context Class Reference] ([acr]) claim and [acr_values] request parameter are related to the [{$pagename}] ([amr]) claim, but with important differences. 

An Authentication Context Class specifies a set of business rules that [authentications] are being requested to satisfy. These rules can often be satisfied by using a number of different specific [Authentication Methods], either singly or in combination. Interactions using [acr_values] request that the specified[ Authentication Context Class] be used and that the result should contain an acr claim saying which [Authentication Context Class] was satisfied. The [acr] claim in the reply states that the business rules for the class were satisfied -- not how they were satisfied.

In contrast, interactions using the [amr] claim make statements about the particular [Authentication Methods] that were used. This tends to be more brittle than using [acr], since the [Authentication Methods] that may be appropriate for a given [authentication] will vary over time, both because of the evolution of attacks on existing methods and the deployment of new [Authentication Methods].

!! More Information
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