Method and arrangement for protecting electronic computing units, in particular chip cards

摘要

The invention concerns a method and arrangement for protecting electronic computing units from undesired access. According to the invention, the side of the unit (1) exposed to attack is provided with a casing (2) having inhomogeneous properties. The unit (1) determines measured values at at least one set measuring point on the casing (2) when specific signals have been applied by the unit (1) to the casing (2) at a set signal-output point, a signature characteristic of an intact casing (2) at the time of the measurement being formed using the measured values.