2. The method of claim 1 , wherein receiving the first representation of the access token from the IdP further comprises: generating an original token; modifying the original token to obtain a modified token; and providing the modified token to the IdP to obtain an access token for accessing the RP.
3. The method of claim 2 , wherein the first representation of the access token includes a signed modified token by the IdP and second representation of the access token includes a signed original token by the IdP.