Step up authentication OpenID Connect
A common use case in access management is step up authentication. ForgeRock AM is very good for that. The OIDC standard talks about step up authentication and level of authentication requested by the client.
To do so, one could use acr_values which is a voluntary claim, but the openid specification says : « the Authorization Server is not required to provide this Claim in its response. »
In order to achieve that, the essential claim acr is used, it is describe in chapter 18.104.22.168. Requesting the “acr” Claim of the OpenID Core (see: http://openid.net/specs/openid-connect-core-1_0.html#acrSemantics)
Read more at – Step up authentication OpenID Connect