| 摘要 |
<p>A method and a device for facilitating authorized and simultaneously restraining unauthorized access to a multitude of alphanumeric sequences, for instance for credit cards, code keys and the like. According to the method every correct sequence (e.g. 5533) is encrypted by mathematically manipulating it by means of an encrypting sequence (7221) common to every correct sequence, so that every correct sequence is converted into a fictitious encrypted sequence. The credit card has carrier means (12-16) for carrying and exposing the fictitious sequence. A deciphering of the fictitious sequence is performed by a reversed mathematical manipulation of the fictitious sequence.</p> |
