| 摘要 |
<p>A system and method are disclosed for determining whether a sender (120 a-d) seeking to send a message to a receiving computer (102) system via a network is an authorized sender. A request to communicate is received from the sender (120 a-d). A number N1 is selected. A hash value for the number N1 is calculated. The hash value is sent to the sender (120 a-d).</p> |
