Abstract: This invention relates to a method and system for verifying authenticity safe against forgery of an object releasing a function said object being of base material having random imperfections in or on the same, comprising measuring random imperfections in or on the base material of said object in a predetermined measuring track over the surface of said object of base material having random imperfections in or on the same by means of a detector for detecting said random imperfections, said random imperfections optionally being supplied to said base material, converting said measured random imperfections into pulses, supplying said pulses together with timing pulses to an AND gate, whereby only simultaneously arriving pulses are passed, supplying said passed pulses to a shift register shifting with said timing pulses to obtain a binary code, comparing said binary code with a previously stored binary code of the same object, whereby the function is released if said binary codes are identical; as well as a system

Abstract: A method of manufacturing documents such as paper money, credit cards, identification cards and the like in a manner so as to prevent forgeries thereof, comprises the steps of producing a base material, coating fibers with a magnetic or magnetizable material, and embedding the fibers into the base material during the production of the base material; an apparatus for checking the authenticity of documents such as paper money, credit cards, identification cards, and the like comprises in combination a document having fibers which are coated with a magnetic or magnetizable material embedded therein, detecting means for scanning the document to determine the number of magnetic particles present in the document, and means for moving the document and the detecting means relative to each other so as to provide a scanning trace, the document and the detecting means being disposed in a close relationship to each other.