An Optical Encryption and Decryption Method and System

Jesper Glückstad (Inventor)

    Research output: Patent

    48 Downloads (Pure)


    The invention relates to securing of information utilising optical imaging technologies and more specifically to phase encryption and decryption of images. An image is encrypted into a mask having a plurality of mask resolution elements (Xm, Ym) by encoding the image using e.g. a phase mask with an encoded phase value phi (Xm, Ym) and an encoded amplitude value a (Xm, Ym), and by further encrypting the mask (using e.g. a spatial light modulator) by addition of an encrypting phase value phi c (Xm, Ym) to the encoded phase value phi (Xm, Ym) and by multiplication of an encrypting amplitude value ac (Xm, Ym) with the encoded phase value a (Xm, Ym). The method of decrypting comprises the steps of decrypting the mask by radiating electromagnetic radiation towards the mask and inserting into the path of the electromagnetic radiation a complex spatial electromagnetic radiation modulator comprising modulator resolution elements, the decrypting phase value phi d (Xd, Yd) and the decrypting amplitude value ad (Xd, Yd) respectively, of a modulator resolution element (Xd, Yd) being substantially equal to - phi c (Xm, Ym) and ac (Xm, Ym).
    Original languageEnglish
    Patent numberWO00/02339 A1
    Filing date13/01/2000
    CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
    Publication statusPublished - 2000

    Fingerprint Dive into the research topics of 'An Optical Encryption and Decryption Method and System'. Together they form a unique fingerprint.

    Cite this