METHOD AND DEVICE FOR SECURING DOCUMENTS Russian patent published in 2017 - IPC G06K9/00 

FIELD: physics.

SUBSTANCE: method includes a stage of printing the distribution of dots in the document, at which there is an unexpected deviation of, at least, one geometrical parameter of the printed dots, and a stage of creating the said distribution of dots before the printing stage, with the condition that due to the random errors: at least, half of dots of each distribution did not contact with four other distribution dots by their sides, and, at least, one dimension of, at least, a part of the dots of the said distribution had the same magnitude order that the average absolute value of the said unexpected deviation. In particular embodiments of creating the distribution of dots, more than half of these dots do not contact any other dot of the said distribution. In particular embodiments of creating the distribution of dots, the dots are obtained, when, at least, one geometric characteristic of which is variable, wherein the geometric amplitude of the obtained deviation has the averaged magnitude order of, at least, a part of dots.

EFFECT: improving the document security.

21 cl, 32 dwg