FIELD: coding equipment. SUBSTANCE: coding device has light source 1, photo receiver 7, comparison unit 8, key 3. Located in key 3 is coding hologram which is made up of bright and dark fields. At installing key 3 in device, hologram is located at angle to light flux which is equal to angle between hologram and base flux at its recording. Photo receivers are optically conjugating with bright and dark fields of image recorded in coding hologram "1-3-7-8". EFFECT: high efficiency. 3 cl, 5 dwg
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