Method for performing a check of a stacked system

A stacked system comprising:

• at least one first function;
• at least one checking gate;
• and
• a second function, wherein
• the at least one first function is configured to be applied to input data to generate intermediate output data,
• the checking gate is configured to perform a check of the intermediate output data,
• the second function is configured to be applied to the intermediate output data if the check is positive, and
• the second function is configured to be applied to the intermediate output data to generate an output data.

A system configured to perform a check of a stacked system comprising:

• an interface;
• and
• a computation unit, wherein the interface and the computation unit are configured to cooperatively perform,
• receiving input data,
• applying a first function to generate an intermediate output data,
• performing a check based on the intermediate output data if the check is positive,
• providing the intermediate output data to a second function at least as part of an intermediate input data,
• applying the second function to the intermediate input data to generate an output data, and
• providing the output data or providing a warning message if the check is negative.