System and method for preventing delivery of unsolicited and undesired electronic messages by key generation and comparison
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United States of America Patent
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Jun 29, 2010
Grant Date -
Nov 10, 2005
app pub date -
Dec 13, 2004
filing date -
May 4, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A sending device prepares a key for each electronic message sent by the device by applying an algorithm to specified data in the message and then incorporates the key in the message. A receiving device, upon receipt of an electronic message, locates the incorporated key and the data from which a sending device practicing the invention would have prepared it. The receiving device communicates a confirmation request to the purported sending device which contains the key and the data for its preparation. The sending device receives the confirmation messages and prepares a comparison key by applying the algorithm to the data in the confirmation request. The sending device replies to the confirmation request confirming that the sending device sent the message if the comparison key matches the key in the confirmation request and otherwise responds with a denial.
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