Secure visual message communication method and device

A method of and a device ( 501 ) for reconstructing a graphical message ( 520 ) using visual cryptography. Cells ( 303, 304 ) in a first liquid crystal display ( 701 ) are activated if a bit in a message sequence represents '1', and not activated if said bit represents '0'. Cells...

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Bibliographische Detailangaben
1. Verfasser:	SCHRIJEN GEERT J.,TUYLS PIM T.,KEVENAAR THOMAS A.M.,JOHNSON MARK T
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CALCULATING COMPUTING COUNTING CRYPTOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DISPLAY EDUCATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY FREQUENCY-CHANGING JAMMING OF COMMUNICATION NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS SEALS SECRET COMMUNICATION TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A method of and a device ( 501 ) for reconstructing a graphical message ( 520 ) using visual cryptography. Cells ( 303, 304 ) in a first liquid crystal display ( 701 ) are activated if a bit in a message sequence represents '1', and not activated if said bit represents '0'. Cells ( 303, 304 ) in a second liquid crystal display ( 511 ) are activated if a bit in a key sequence represents '0', and not activated if said bit represents '1'. The first and second displays ( 701, 511 ) are then superimposed so as to visually reconstruct the graphical message ( 520 ). Preferably a portion of a polarization filter ( 305 ) in an area of the first liquid crystal display ( 701 ), and a corresponding portion of a polarization filter ( 302 ) in an area of the second liquid crystal display ( 511 ) have been omitted to allow superimposition of the first and second liquid crystal displays ( 701, 511 ) at said areas.