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

Document Type Replaced Internet-Draft (individual)
Authors Marco Tiloca  , Ludwig Seitz  , Francesca Palombini  , Sebastian Echeverria  , Grace Lewis 
Last updated 2021-10-25
Replaced by draft-ietf-ace-revoked-token-notification
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Intended RFC status (None)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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. The method relies on resource observation for the Constrained Application Protocol (CoAP), with Clients and Resource Servers observing a Token Revocation List on the Authorization Server. Resulting unsolicited notifications of revoked Access Tokens complement alternative approaches such as token introspection, while not requiring additional endpoints on Clients and Resource Servers.


Marco Tiloca (
Ludwig Seitz (
Francesca Palombini (
Sebastian Echeverria (
Grace Lewis (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)