Method and System for Establishing the Identity of an Originator of Computer Transactions

A method of identifying the originator of a message transmitted between a client and a server system is provided. The method includes modifying a message to be transmitted between a client and a server system to include a session identification flag and/or a session identifier 500 (e.g., at an end of the message). The method optionally includes one or more of the steps of re-computing a control portion of the message to reflect the inclusion of the session identification flag and the session identifier 502 , transmitting the message between the client and the server system 504 , and checking the transmitted message for the session identification flag 506 , reading the session identifier of the transmitted message to determine the originator of the message 508 , removing the session identification flag and/or the session identifier from the transmitted message 510 , and re-computing the control portion of the message to reflect the removal of the session identification flag and/or the session identifier 512.