datenverarbeitungseinrichtung and methods for its operation to prevent a differential stromverbrauchanalyse

摘要

The invention relates to a data processing device (100) and to a method for operating a data processing device, notably a chip card. The device comprises an integrated circuit (10) which in accordance with a first clock pulse carries out useful calculations, notably cryptographic operations. To this end a second clock pulse is randomly derived from the first clock pulse and supplied to the integrated circuit (10) instead of the first clock pulse. Distances between the edges of the second clock pulse vary randomly over time. To this end the invention provides for a clock control unit (14) which is linked to the integrated circuit (10) as well as for a random generator (12) which is connected to the clock pulse control unit (14). The clock control unit (14) is configured such that it generates a second clock (20) in accordance with the random generator (12) and the first clock pulse (18), and the second clock pulse varies randomly and controls the integrated circuit (10).