Method and system for obfuscating a cryptographic function

A first system (920) for protecting an integrity of a second system (922), the first system comprising

• a string determiner (924) for determining a data string (930) to be protected, an integrity of the data string being an indication of the integrity of the second system;
• a parameterizer (926) for computing a set of parameters (932) at least partly representing a predetermined data processing function, using a redundancy in the set of parameters to incorporate the data string into a bit representation of the set of parameters;
• and
• a means (928) for enabling the second system to process data according to the set of parameters, wherein a change of the data string in the bit representation of the set of parameters causes the system to lose its capability to process the data according to the data processing function.

A data processing system (922) comprising

• a memory (930) for storing a data string to be protected, an integrity of the data string being an indication of the integrity of the data processing system;
• a memory (932) for storing a set of parameters at least partly representing a predetermined data processing function, the data string being incorporated into a bit representation of the set of parameters using a redundancy in the set of parameters;
• and
• a processing module (934) for processing data (936) according to the set of parameters, wherein a change of the data string in the bit representation of the set of parameters causes the system to lose its capability to process the data according to the data processing function.