Patent ID: 7747860
Filing Date: 2010-06-29
Classification: H04L

Abstract:
1. A method comprising: sending to an intended recipient a first electronic message containing information identifying a purported originator of the first electronic message, and further containing a first data string generated by application of an algorithm to a portion of said first electronic message; receiving a second electronic message that includes a request to confirm that said first electronic message was authorized by the purported originator identified in the first electronic message, said second electronic message including said first data string and said portion of said first electronic message; generating a second data string, different from said first data string, by application of an algorithm to said portion of said first electronic message; comparing said first data string to said second data string; and upon determining that said first data string matches said data string, responding to said second electronic message, affirming said purported originator of said first electronic message did not use a false originating address; wherein the algorithm applied to the portion of the first electronic message is selected from a plurality of algorithms based on a time associated with the first electronic message.