ACCESS-PROTECTED DATA CARRIER

摘要

The invention relates to a data carrier, comprising a semiconductor chip (5) with at least one memory. An operating programme which is capable of performing at least one operation (h) is filed in the memory. In order to prevent unauthorised access to the data (x) that is processed with said operation (h), both this data and the operation (h) itself are defamiliarised. The defamiliarisation of the data (x) and the defamiliarisation of the operation (h) are co-ordinated in such a way that the either the output data (y) of the non-defamiliarised operation (h) are produced with the defamiliarised operation (hR1R, hR1R2) or defamiliarised output data (y o R2) from which the output data (y) can be determined.