MESSAGE CHALLENGE RESPONSE
    3.
    发明申请

    公开(公告)号:US20160212079A1

    公开(公告)日:2016-07-21

    申请号:US15081014

    申请日:2016-03-25

    CPC classification number: H04L51/12 G06Q10/107 H04L63/1441

    Abstract: A system and method are disclosed for registering a email sender for the purpose of sending an email message to an email receiver including receiving a challenge message wherein the challenge message includes a machine answerable question; processing the challenge message to determine that it is a challenge message sent for the purpose of authorizing delivery of the email message; analyzing the question to determine a valid response to the challenge message; and sending the valid response that includes the answer wherein a nontrivial amount of resources are required to send the valid response.

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