A method and device for providing a secure sensor chip (1) for recording digital information regarding at least one physical parameter, wherein the recording later can be verified with respect to its authenticity, whether the at least one physical parameter was indeed recorded by the specified chip (1) or not, wherein this is accomplished by providing the sensor chip (1) with a Controlled Physical Random Function (CPUF) in the form of a coating (5) and wherein both the sensor chip (1) and a micro controller (2) controlling all digital inputs (3) and outputs (4) of the sensor chip are both embedded in the CPUF coating (5).