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Integrated physical unclonable function (PUF) with combined sensor and display

A component and tester technology, applied in the direction of instruments, transmission systems, electrical components, etc., can solve a large number of problems

Inactive Publication Date: 2008-10-22
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem with the optical PUF is that a large number of expensive laser diodes are required to provide a sufficient number of nontrivial challenges

Method used

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  • Integrated physical unclonable function (PUF) with combined sensor and display

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Experimental program
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Embodiment Construction

[0026] FIG. 1 shows a cross-sectional side view of an apparatus 100 for forming challenge-response pairs according to an embodiment of the present invention. A laser diode 101 is disposed on a CMOS light sensor / display chip 102 . The laser diode is arranged to emit light into a light scattering element 103 which is a light transmissive material comprising randomly distributed scattering particles 104 so that light incident on the scattering element is randomly scattered onto a plurality of light detectors 105 . The laser beam of the laser diode is typically coupled into the scattering element by means of an optical coupler 106, such as a mirror or facet of the light scattering element. Thus, challenges are presented to light scattering elements in the form of light emitted by laser diodes.

[0027] In case LCD technology is used, the light scattered by the light scattering element propagates through the LC layer 107 through the light detector 105 . A protective glass cover p...

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Abstract

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.

Description

technical field [0001] The present invention relates to apparatus and methods for forming challenge-response pairs. Background technique [0002] A Physically Unclonable Function (PUF) is a structure used to create a tamper-resistant environment in which parties can establish shared secrets. Typically, the proving party should prove the right to access the secret by providing the PUF with a challenge, from which a unique and unpredictable answer is formed. This reply is provided to the verifying party so that it can be verified that the proving party actually has access to the secret. Of course, the proof / verification procedure should be performed without revealing the secret, which usually involves encryption / decryption. The PUF can only be accessed through an algorithm that is inseparable from the PUF, and any other attempt to bypass or manipulate this algorithm will destroy the PUF. Users employ PUFs (implemented, for example, in the form of tokens) to authorize themse...

Claims

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Application Information

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IPC IPC(8): H04L9/32
CPCH04L9/3278G02B26/026G02B26/0833H04L2209/805G02B5/02G02B27/00G06F21/73G09C1/00
Inventor W·G·奥菲B·斯科里克P·T·图伊尔斯A·H·M·阿克曼斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV