Dynamic defense of network attacks

Information security – Access control or authentication – Network

Reexamination Certificate

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C726S011000, C726S012000, C726S022000, C726S023000, C726S024000, C726S025000, C709S223000, C709S224000, C709S225000, C709S226000, C455S410000, C455S411000

Reexamination Certificate

active

08006285

ABSTRACT:
A distributed denial of service attack can be defended against by challenging requests at a machine upstream from the target of the attack. The upstream machine limits access to the victim machine in response to indication of the victim machine being attacked. The upstream machine begins trapping protocol data units destined for the victim machine and challenging requests to access the victim machine with tests that require sentient responses, such as Turing tests. The upstream machine then updates a set of rules governing access to the victim machine based, at least in part, on responses to the challenges or administered tests.

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