Patent ID: 11875589
Assignee: SICPA HOLDING SA
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. A system for verifying the authenticity of a marked original article secured according to the method of claim 1, or the conformity of a copy of such article with respect to the original one, comprising an imager having an imaging unit, a CPU with a memory, and an image processing unit, the memory storing a reference aggregated digital signature of a corresponding batch of articles, and the one-way function and the one-way accumulator being programmed in the CPU, operable to:
acquire a digital image of the security marking on a test object being said article or said copy of the article;
read a representation of article digital data and of an associated article verification key on the acquired digital image of the security marking on the test object, and extract respectively corresponding article digital data and article verification key from said read representation;
verify that the extracted article digital data and associated verification key indeed correspond to the stored reference aggregated digital signature by executing on the CPU the further programmed steps of:
calculating a digital signature of the extracted article digital data with the one-way function;
calculating a candidate aggregated digital signature from the calculated digital signature of the extracted article digital data and the extracted verification key with the one-way accumulator; and
checking that the obtained candidate aggregated digital signature matches the stored reference aggregated digital signature,

whereby, in case said aggregated digital signatures match, the system is operable to deliver an indication that the article data on the test object is that of a genuine original article.