US Patent:
20050257064, Nov 17, 2005
Inventors:
Yann Boutant - Aix-Les-Bains, FR
David Labelle - Soucieu En Jarrest, FR
Herve Seux - Lexington MA, US
International Classification:
H04L009/00
Abstract:
The invention relates to a method for acceptance of a candidate fibrous medium comprising the following steps: a candidate digital signature is generated from a structural characteristic extracted from a reference zone of the fibrous medium, the said digital signature representing the unique, complex, chaotic structure of the reference zone, practically invariable with time; the candidate digital signature is compared with at least one authentic digital signature previously recorded on a digital data medium so as to issue a positive or negative decision about acceptance of the candidate fibrous medium; characterised in that the comparison uses a statistical method to calculate a similarity index between the candidate digital characteristic and the authentic digital signature, and to compare this similarity index with a given acceptance threshold, so as to enable issuing a positive acceptance decision if the candidate digital signature does not exactly correspond to the authentic digital signature with which it is compared.