[Openid-specs-ab] How to handle encrypted id_token in authorization request.

[Emmanuel Raviart]

According to last draft of section "2.1.2. Authorization Request" of 
"OpenID Connect Messages 1.0", the parameter id_token may be added to 
authorization request:
http://openid.net/specs/openid-connect-messages-1_0.html#auth_req

But, when the id_token has been encrypted using the registered 
id_token_encrypted_response_alg, the IdP will not be able to decrypt it.

How should an encrypted id_token be handled in authorization request?

Emmanuel