Device for generating at least one cryptographic key, corresponding methods and computer program products

A device for generating at least one cryptographic key, said device including at least one cryptographic element, the device comprising:

• circuitry configured to implement generate a cryptographic key comprising:
• selecting at least three input data, each of said at least three input data being selected among predetermined data and a function of at least one piece of data having a type belonging to a group consisting of:
• a physical unclonable type, corresponding to physical unclonable function data;
• a hardwired type, corresponding to data hardwired within said device;
• and
• a software type, corresponding to software data, the predetermined data having a same size as the physical unclonable function data, the data hardwired within said device, and the software data;
• after selecting said at least three input data, assembling said at least three input data to produce an assembled input data, a size of the assembled input data being constant regardless of whether the predetermined data is selected;
• and
• applying the assembled input data into a cryptographic element to produce said cryptographic key.