Defending against denial of service attacks

Details Defending against denial of service attacks Defending against denial of service attacks

2011-05-03

2011-05-03

Zee, Edward (Department: 2435)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C726S022000, C726S002000, C726S003000

Reexamination Certificate

active

07937586

ABSTRACT:
In various embodiments, a server may be provided. The server may respond to a request for a service, from a processing device, with a challenge. The challenge may include a partial key for a memory-intensive operation, a number of iterations of the memory-intensive operation to perform, and a result of performing the number of iterations of the memory-intensive operation. Upon receiving the challenge, the processing device may choose a complete key consistent with the partial key and may produce a proposed result by performing the memory-intensive operation for the number of iterations. When the proposed result matches the result included in the challenge, the processing device may send a challenge answer, including the chosen complete key, to the server. Upon receiving a correct challenge answer from the processing device, the server may access the requested service and may return a result of the access to the processing device.

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