US 2009/0265758 A1 · ATTACH DETECTION WITH COATING PUF

Abstract

The present invention relates to a method of authenticating a physical token (14) which provides measurable parameters, and a device (11) comprising a physical token (14) which provides measurable parameters for authentication. A basic idea of the invention is to utilize properties of a physical token (14) comprised in a device (11) to detect whether the device has been tampered with. In an enrolment phase, values of a plurality of physical parameters provided by the physical token are measured. This set of measured values is referred to as response data. Noise-correcting data, also referred to as helper data, is employed to provide noise-robustness to the response data in a secure way. Then, in an authentication phase, the parameter values are measured again, and the noise-correcting data is employed to derive verification data. The verification data is compared with the enrolment data and a determination is made whether the derived verification data corresponds to the enrolment data. If so, the physical token is considered to be authenticated.

Claims16

Dependent claims

A method of authenticating a physical token (14) which provides measurable parameters, the method comprising the steps of:

measuring values (R′0, . . . , R′N−1) of a plurality (N) of said parameters provided by the physical token (14);
processing the measured values (R′0, . . . , R′N−1) with noise-correcting data (W0, . . . , WN−1) to derive verification data (S′0, . . . , S′N−1);
comparing the verification data (S′0, . . . , S′N−1) with enrolment data (S0, . . . , SN−1) derived from the noise-correcting data and values (R0, . . . , RN−1) of said plurality (N) of parameters measured during an enrolment of the physical token;
and
determining whether the derived verification data (S0′, . . . , S′N−1) corresponds to the enrolment data (S0, . . . , SN−1), wherein the physical token is considered to be authenticated if there is correspondence between the verification data and the enrolment data.

2 more elements

Dependencies are inferred from the claim text.

Attach detection with coating puf

Life of this patent

Attach detection with coating puf

Life of this patent

Abstract

Claims16