Optical anti-counterfeiting systems comprised of an analog mask having submicron size, three-dimensional structures which serve as a non-replicable key and an optoelectronic verification device for identifying such keys

'analog':9 'anti':3 'anti-counterfeit':2 'compris':6 'counterfeit':4 'devic':30 'dimension':16 'identifi':32 'key':25,34 'mask':10 'non':23 'non-replic':22 'optic':1 'optoelectron':28 'replic':24 'serv':19 'size':13 'structur':17 'submicron':12 'system':5 'three':15 'three-dimension':14 'verif':29

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