| 摘要 |
PURPOSE:To detect easily the foul use of a card at the device side by preparing plural password including an emergency code in addition to a normal password for a user and selecting optionally the right use with each password. CONSTITUTION:For instance, a password C1 is prepared for the normal use of a user together with other codes C2-C4 used for emergency respectively. A password supplied from the user through a keyboard 3 is sent to a control part 5. The part 5 carries out a transaction as desired by the user when the code C1 is supplied. If the input code is not coincident with any of those passwords C1-C4, the part 5 decides a keying mistake and allows the retry. While an emergency signal is produced on an emergency information signal line 8 consisting of a wire or wireless signal line, etc. and led to outside in case the input code is coincidence with either one of passwords C1-C4. At the same time, a normal transaction is permitted as desired by the user. In such a way, the probability is greatly reduced for the foul use of a card. |
