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System and method for the detection of and reaction to denial of service attacks

  • US 7,107,619 B2
  • Filed: 08/31/2001
  • Issued: 09/12/2006
  • Est. Priority Date: 08/31/2001
  • Status: Active Grant
First Claim
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1. A computer implemented method for detecting denial of service attacks, comprising the steps of:

  • issuing a bit encoded login challenge composed of human viewable images not composed of machine readable text in response to a login request to said computer from a requester of services; and

    responsive to an incorrect response to said challenge, said computer placing said requester in a state of limited service.

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