Patent ID: 7137007

Claim:
A device for authenticating user's access rights to resources by verifying the legitimacy of a signature generated to prove the right of said user, said device comprising: first memory means for storing user unique identifying information e; second memory means for storing a customized signature key t calculated from both said user unique identifying information e and a signature key x; first generation means for generating a presignature by use of said user unique identifying information e held by said first memory means; second generation means for generating a signature by use of said customized signature key t held by said second memory means; and verification means for verifying the legitimacy of said signature generated by said second generation means, said first generation means and said second generation means are comprised in proof data generation means and are cooperating with each other to generate said signature, the proof data generation means being coupled to access ticket generation means; the access ticket generation means generating an access ticket and providing the access ticket to the proof data generation means; and the proof data generation means and the access ticket generation means are within the device.