| 摘要 |
<p>A financial information input method using a symmetric key security algorithm and a mobile communications commercial transaction system using the same encrypts financial information such as a customer's identification number and a valid date with a symmetric key algorithm by use of an electronic wallet administration number (K1) used as an encryption key at the time of applying an issuance of a card, and inputs the encrypted financial information into a customer's communications terminal. In the case that a commercial transaction settlement is accomplished with a mobile communications terminal in which the encrypted financial information is stored (M1, M2), a corresponding electronic wallet administration number (K1) is inputted so that the encrypted financial information and administration number are optically transmitted to a POS terminal/card inquiry machine of an affiliated shop, wherein the POS terminal/card inquiry machine uses the received electronic wallet administration number to decode the encrypted financial information with the administration number, thus preventing that customer's financial information being illegally copied.</p> |
