Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network access regulating
Reexamination Certificate
2006-11-28
2006-11-28
Winder, Patrice L. (Department: 2145)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network access regulating
C709S226000, C709S229000, C713S168000
Reexamination Certificate
active
07143163
ABSTRACT:
A system for, and method of, controlling access to a resource of a computer system. In one embodiment, the system includes: (1) a database of problems and corresponding precalculated solutions, (2) a problem retriever that responds to a request from a client for access to the resource by retrieving one of the problems from the database and transmitting the one of the problems to the client and (3) a solution evaluator that, upon receiving a putative solution from the client, employs the database to validate the putative solution and, if the putative solution is valid, grants the client access to the resource.
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Bleichenbacher Daniel
Jakobsson Bjorn M.
Lucent Technologies - Inc.
Winder Patrice L.
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