RFC 9770 on Notification of Revoked Access Tokens in the Authentication and Authorization for Constrained Environments (ACE) Framework

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        RFC 9770

        Title:      Notification of Revoked Access Tokens 
                    in the Authentication and Authorization for 
                    Constrained Environments (ACE) Framework 
        Author:     M. Tiloca,
                    F. Palombini,
                    S. Echeverria,
                    G. Lewis
        Status:     Standards Track
        Stream:     IETF
        Date:       June 2025
        Mailbox:    marco.tiloca@ri.se,
                    francesca.palombini@ericsson.com,
                    secheverria@sei.cmu.edu,
                    glewis@sei.cmu.edu
        Pages:      64
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-ace-revoked-token-notification-09.txt

        URL:        https://www.rfc-editor.org/info/rfc9770

        DOI:        10.17487/RFC9770

This document specifies a method of the Authentication and
Authorization for Constrained  Environments (ACE) framework, which
allows an authorization server to notify clients and resource servers
(i.e., registered devices) about revoked access tokens. As specified
in this document, the method allows clients and resource servers
(RSs) to access a Token Revocation List (TRL) on the authorization
server by using the Constrained Application Protocol (CoAP), with the
possible additional use of resource observation. Resulting
(unsolicited) notifications of revoked access tokens complement
alternative approaches such as token introspection, while not
requiring additional endpoints on clients and RSs.

This document is a product of the Authentication and Authorization for Constrained Environments Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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