| 摘要 |
<p>An invention for digital authentication is provided. A first timing signal is received from a remote source using a receiver. Next, a delay number (630) is stored. The delay number (630) is based on a first delay time period between when the first timing signal was transmitted and when the first timing signal was received. A digital transaction is then authenticated using the delay number. The remote source can be any source capable of generating timing signals, such as a global positioning satellite (GPS) system (402) or a cell tower system. The delay in the timing signals can be caused by free electrons in a line of sight between the remote source and the receiver, such as by variations in atmospheric conditions or by an object within the line of sight such as bird or a tree branch. Optionally, the delay number (630) can be stored on a user card (410) and a system card. In this aspect, a transaction between the user card (410) on a client computer (409) and the system card on a server computer can be authenticating by comparing the delay number (630) stored on the user card to the delay number (630) stored on the system card.</p> |
