Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication
Reexamination Certificate
2002-12-19
2009-06-02
Moise, Emmanuel L (Department: 2437)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Central trusted authority provides computer authentication
Reexamination Certificate
active
07543139
ABSTRACT:
In accordance with the present invention, there is given methods, systems and apparatus for revoking a derived credential formed from an initial credential and an indication value within a network. An example method comprises the steps of: updating an accumulator value based on a plurality of user credential keys where each user credential key is associated with a user device entitled to the derived credential; providing public information that comprises a public key for verifying the initial credential and the accumulator value; an entity receiving from a user device derived-credential information comprising an initial-credential information and an indication-value information indicating that the user credential key is inherently included in the accumulator value, and request information; and, processing the request information in response to verifying by the entity that the initial-credential information and the indication-value information are valid.
REFERENCES:
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patent: 5699431 (1997-12-01), Van Oorschot et al.
patent: 6044462 (2000-03-01), Zubeldia et al.
patent: 6516316 (2003-02-01), Ramasubramani et al.
patent: 6775782 (2004-08-01), Buros et al.
Camenisch Jan
Lysyanskaya Anna
Abyaneh Ali S
Cantor & Colburn LLP
International Business Machines - Corporation
Moise Emmanuel L
Yamonaco Lisa
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