Integrating OAuth with Information card systems

We propose a novel scheme to provide client-based interoperation between OAuth and an Information Card system such as CardSpace or Higgins. In this scheme, Information Card users are able to obtain a security token from an OAuth-enabled system, the contents of which can be processed by an Information Card-enabled relying party. The scheme, based on a browser extension, is transparent to OAuth providers and to identity selectors, and only requires minor changes to the operation of an Information Card-enabled relying party. We specify its operation and describe an implementation of a proof-of-concept prototype. Security and operational analyses are also provided.