US 4,218,674 A · Method and a system for verifying authenticity safe against forgery

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 for carrying out the method.

Claims6

Dependent claims

A system for verifying the authenticity safe against forgery of a document by comparison of binary output signals therefrom with binary output signals previously stored, said system comprising:

(1) a document having randomly dispersed fibers of a magnetic or magnetizable material embedded within at least part of the base material of said document in order to give said documents an imperfection pattern individual thereto, said fibers having magnetic properties different from said base material,
(2) means for detecting said fibers in a predetermined measuring track over the surface of said document,
(3) means to convert said detected random fibers into an asymetric analogous pulse train,
(4) discriminator means for separating such pulses from said pulse train which have amplitudes exceeding a predetermined threshold value from pulses having smaller amplitudes than said level,
(5) a converter for converting said first-mentioned pulses to a series of detected pulses,
(6) means for producing a measuring start and stop signal defining the active scanning time period,
(7) a timing means supplying timing pulses, said timing means being indicia on the surface of said document, and
(8) means to coordinate said series of detected pulses and said timing pulses to produce a series of binary output signals, whereby a comparison will develop the indentity of said document.

5 more elements

A method of verifying the authenticity of documents having a base material provided with randomly dispersed fibers of a magnetic or magnetizable material embedded within at least part of said material in order to give each document an imperfection pattern individual thereto and said imperfections having magnetic properties different from said base material, said method comprising the steps of:

(a) scanning at least one predetermined measuring track over the surface of said document with a scanner capable of measuring said magnetic properties to produce an asymmetric analogous pulse train representative of the number, distribution and magnetic properties of the fibers present in said track,
(b) separating such pulses from said pulse train which have amplitudes exceeding a predetermined threshold value from pulses having smaller amplitudes than said value,
(c) converting said first-mentioned pulses to a series of detected pulses having equal amplitudes but unequal pulse lengths proportional to the energy contents of each corresponding first-mentioned pulse,
(d) producing a measuring signal defining the scanning time period,
(e) producing a timing pulse train having a fixed pulse repetition frequency, said timing pulse train being supplied by indicia on the surface of said document,
(f) coordinating said timing pulse train with said series of detected pulses during said scanning time period to produce a series of binary output signals comprising one pulse for each time coincidence of a timing pulse with at least part of a detected pulse, and
(g) comparing said binary output signals with a binary output signal previously registered by means of steps (a) to (f) for the actual document to be verified and stored in a central computer.

4 more elements

Dependencies are inferred from the claim text.

Method and a system for verifying authenticity safe against forgery

Life of this patent

Method and a system for verifying authenticity safe against forgery

Life of this patent

Abstract

Claims6