[OAUTH-WG] Wrapping access token and codes

[Sergey Beryozkin <[e-mail]>]

Hi

Does it make sense to consider supporting an access token or code 
wrapping as part of the standard OAuth2 responses ?

For example, if a client has registered its public key with AS then say 
the access token response would contain the regular

{"access_token":"1234345"}

except that "1234345" would actually be a JWE RSA-OAEP wrapped opaque 
token with a client's public key being used. Or a direct key encrypted 
token if the client and the server only share the client secret 
allocated to the client during the registration.

The net result is that only the registered confidential client would be 
able to extract the actual opaque access token. The response would 
actually be

{"access_token":"1234345", wrapped:true}.

I definitely plan to use this approach as a simple mechanism for making 
a safer distribution of mac keys as part of access token responses; but 
IMHO it can be handy for minimizing the possibility of the 
access/refresh tokens or codes being intercepted...

Sergey