INTEGRATED PHYSICAL UNCLONABLE FUNCTION (PUF) WITH COMBINED SENSOR AND DISPLAY

摘要

The present invention relates to a device ( 100, 200, 300 ) and a method for creating challenge-response pairs. A basic idea of the present invention is to create a challenge in the form of light emitted onto a light scattering element ( 103, 203 ), which light will be scattered in the light scattering element and detected as a response to the challenge by light detecting elements ( 105, 205 ). The light scattering element comprises a transmissive material which contains randomly distributed light scattering particles ( 104, 204 ), which scatter incident light such that a random speckle pattern is created and spread over the light detecting elements. This random pattern is detected by the light detecting elements, and is known as the response to the challenge (i.e. the light) that was supplied to the light scattering element. Hence, a challenge-response pair is created. Further, picture elements ( 109, 209 ) are included in the device in order to enable modification of the challenge created by a light source ( 101, 201 ) and supplied to the light scattering element. By activating picture elements and thereby modifying the challenge, one will also modify the response that corresponds to the modified challenge.