FIELD: physics.
SUBSTANCE: invention relates to a method of confirming a document, a method of verifying a document having a visual marking, and a marker for printing visual marking on a physical document. Method of authenticating a document comprises steps of: providing a registered marker with identification data of the marker, wherein the marker is configured to print visual markings, obtaining a document identifier based on at least the identification data of the marker and the time stamp, obtaining a document key, encoding a document identifier and a document key in the form of a visual marking, applying a visual marking to the document, obtaining a copy of the document with or without visual marking, copy is encrypted so that it can be decrypted using the document key, the encrypted copy is stored in conjunction with the document identifier.
EFFECT: high level of document counterfeit protection.
17 cl, 19 dwg
