| 摘要 |
<p>A system provides a card (24) whereon a keyboard (72) is provided. The card (24) has contacts (80) on the rear thereof. The card (24) is brought into electrical contact with apparatus requiring use of a keyboard (72). Three embodiments are given, firstly, an automatic teller unit (10), secondly, a transfer terminal (188) for transferring funds between cards, and thirdly, a telephone (256). Each card (24) is provided with a money memory wherefrom numbers can be subracted in payment or whereto numbers may be added to effect payment to the card (24). Each card is capable of a validation process whereby numbers entered on the card keyboard (72) are compared with a secret number stored in an inaccessible read-only memory (78) and the results of comparison between the keyboard (72) entered sequence and the stored number provided to the outside apparatus. The card (24) is provided with a delay between successive instances of attempts to enter the personal identification number thereby to slow down the process of trial and error of discovery of a personal identification number.</p> |
