| 摘要 |
The invention relates to a method for counterfeit detection of identification documents which contain data fields having IR-absorbing personalized data, and to an associated computer program or computer-readable storage medium. The method comprises the following steps: (i) reading out a data field, which contains an IR-absorbing personalized data set, using an IR reading device; (ii) determining a number of alphanumerical characters in the read-out data field in an evaluation unit; and (iii) providing an expected value for the data field, which contains the IR-absorbing personalized data set, in the evaluation unit, wherein the expected value is determined as a function of a predetermined number of characters which are to be expected in the data field, or wherein additionally a length of the read-out data field is determined and a maximum number of characters is calculated on the basis of the length and a predetermined average character size, which are to be expected in the data field, the expected value being determined as a function of the calculated maximum number of characters; and (iv) comparing the determined number of characters with the expected value with regard to this data field in the evaluation unit, and generating a test signal in the event that the number of characters exceeds the expected value. |
