Apparatus and method for processing data by a reconfigurable part of a digital chip

A computer-implemented apparatus for processing data, having a digital chip having at least one reconfigurable part that is reconfigurable by a number N of configuration descriptions, with N≥2,

• a determined configuration description from the number N for reconfiguring the at least one reconfigurable part into a reconfigured part, and
• a providing unit for providing an identifier specific to the determined configuration description by using a number A of derivation parameters comprising the determined configuration description, with A≥1,
• wherein the reconfigured part with the determined configuration description is configured to perform a cryptographic function on determined data by using the provided identifier specific to the determined configuration description to generate cryptographically processed data,
• wherein the providing unit is set up to provide an identifier specific to a group of determined configuration descriptions, the group of determined configuration descriptions including at least two determined configuration descriptions of the number N of configuration descriptions,
• wherein the providing unit is set up to form a hash value as the identifier specific to the group of determined configuration descriptions by applying a determined hash function to the group of determined configuration descriptions.