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Message challenge response

  • US 9,021,039 B2
  • Filed: 03/26/2014
  • Issued: 04/28/2015
  • Est. Priority Date: 07/16/2002
  • Status: Expired due to Fees
First Claim
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1. A method of registering an electronic-mail (e-mail) sender for the purpose of sending e-mail messages to an e-mail recipient, the method comprising:

  • receiving an e-mail sent by the e-mail sender to the e-mail recipient;

    executing instructions stored in memory, wherein execution of the instructions by a processor of an independent third-party auditorgenerates a challenge message in response to an e-mail message received by the e-mail recipient, wherein;

    the challenge message includes a machine answerable question, a nontrivial amount of resources are required to determine a valid response to the machine answerable question, andthe non-trivial amount of resources is adjustable by the independent third-party auditor;

    sending the challenge message to the e-mail sender;

    receiving a response to the challenge message sent by the e-mail sender, wherein the validity of the response is evaluated by the independent third-party auditor; and

    sending a report generated by the independent third-party auditor to the e-mail recipient, the report indicating the validity of the response, wherein the e-mail recipient processes registration of the e-mail sender based on the report.

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