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

Claim 9:
10. A method of verifying the authenticity of an article secured according to the method of claim 1, or the conformity of a copy of such secured article with respect to the original one, characterized by comprising the steps of, upon viewing a test object being said article or said copy of the article:
acquiring a digital image of the security marking on the test object by means of an imager having an imaging unit, a CPU with a memory, and an image processing unit;
reading 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 extracting respectively corresponding article digital data and article verification key from said read representation;
having stored in the memory a reference aggregated digital signature of a corresponding batch of articles, and having programmed in the CPU the one-way function and the one-way accumulator;
verifying that the extracted article digital data and associated article verification key indeed correspond to the stored reference aggregated digital signature by performing the 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 article 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 article data on the test object is that of a genuine original article.