As I previously described<https://self-issued.info/?p=1967>, members of the 
OAuth working group have developed a simplified approach to providing 
application-level proof-of-possession protections for OAuth 2.0 access tokens 
and refresh tokens.  This approach is called OAuth 2.0 Demonstration of 
Proof-of-Possession at the Application Layer (DPoP).  Among other benefits, it 
does not require a complicated and error-prone procedure for signing HTTP 
requests, as some past approaches have.

However, the DPoP specification to date has assumed that the client is using 
the OAuth authorization code flow.  As promised at the last IETF meeting, we've 
now published a simple companion specification that describes how DPoP can be 
used with the OAuth implicit flow - in which access tokens are returned 
directly from the authorization endpoint.  The specification is mercifully 
brief because very little had to be added to supplement the existing DPoP spec 
to enable use of DPoP with the implicit flow.  Thanks to Brian Campbell and 
John Bradley for whiteboarding this solution with me.

Finally, in a related development, it was decided during the OAuth virtual 
interim meeting today to call for working group adoption of the core DPoP 
draft.  That's an important step on the journey towards making it a standard..

The specification is available at:

  *   https://tools.ietf.org/html/draft-jones-oauth-dpop-implicit-00

An HTML-formatted version is also available at:

  *   https://self-issued.info/docs/draft-jones-oauth-dpop-implicit-00.html

                                                       -- Mike

P.S.  This notice was also posted at https://self-issued.info/?p=2063 and as 
@selfissued<https://twitter.com/selfissued>.

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