Re: [OAUTH-WG] Token substitution in DPoP

2020-11-20 Thread Nikos Fotiou
Hi, The token is granted to a client based on the authorization grant and not the client's key. Therefore, a client may use a different key per token. At least this is an approach we are following. Best, Nikos -Original Message- From: OAuth On Behalf Of Justin Richer Sent: Friday, Nov

[OAUTH-WG] Token substitution in DPoP

2020-11-20 Thread Justin Richer
While working on an implementation of DPoP recently, I realized that the value of the access token itself is not covered by the DPoP signature at all. What I’m wondering is whether or not this constitutes an attack surface that we care about here. Here’s how it works: Let’s say that a client c