Anonymous selectable credential system and method therefor
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United States of America Patent
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Nov 15, 2011
Grant Date -
Mar 27, 2008
app pub date -
Sep 24, 2007
filing date -
Sep 25, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides an anonymous selectable credential system and method therefor. In the system, a credential authority issues root credentials to a user for certain user rights. The user generates an anonymous selectable credential from the root credentials that correspond to a selected set of user rights, and presents the anonymous selectable credential to a service. Using the anonymous selectable credential, the user can prove to the service through a knowledge proof that the selected set of user rights was granted by the credential authority. Then the service may provide service to the user according to the verified user rights. By generating and presenting different anonymous selectable credentials, the user could remain anonymous no matter how many times he/she accessed one or more services. The user can selectively prove any portion of his/her full set of rights, and no matter how many rights is to be proved, the computational cost is basically the same as that for proving only one right.
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