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Service Providing System, Outsourcer Apparatus, Service Providing Method, and Program

  • US 20090089575A1
  • Filed: 05/31/2006
  • Published: 04/02/2009
  • Est. Priority Date: 06/23/2005
  • Status: Abandoned Application
First Claim
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1. A service providing system including a user apparatus, an entrustor apparatus for registering the user apparatus as a member for receiving a predetermined service when a registration request for enrolling the user apparatus as the member is received from the user apparatus, and an outsourcer apparatus for providing said predetermined service to the member which has requested said predetermined service on behalf of said entrustor apparatus, the arrangement being such that when said outsourcer apparatus is requested to provide said predetermined service by the user apparatus, said outsourcer apparatus authenticates whether the user apparatus is said member or not according to a group signature scheme, whereinsaid entrustor apparatus comprises:

  • a group key generator that generates public information, a member registration key, and an open key for use in said group signature scheme;

    a public information provider that provides the public information generated by said group key generator to said outsourcer apparatus;

    a signature key generator that generates a signature key corresponding to said user apparatus using said public information and said member registration key, in response to said registration request from said user apparatus; and

    a signature information provider that provides the signature key generated by said signature key generator and said public information to said user apparatus;

    said user apparatus comprises;

    a group signature generator that generates group signature data using the signature key and the public information provided by said signature information provider, and a request for said predetermined service; and

    a group signature data provider that provides the group signature data generated by said group signature generator and the request for said predetermined service to said outsourcer apparatus; and

    said outsourcer apparatus comprises;

    an authenticator that authenticates the group signature data provided by said group signature data provider as being legitimate or not using the public information provided by said public information provider; and

    a service provider that provides said predetermined service to said user apparatus in response to the request for said predetermined service if said authenticator judges that said group signature data are legitimate.

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