Optical encryption and decryption method and system

Details Optical encryption and decryption method and system Optical encryption and decryption method and system

2005-06-14

2005-06-14

Moise, Emmanuel L. (Department: 2131)

Cryptography

Video cryptography

Video electric signal masking

C380S058000, C380S059000, C382S276000, C359S002000, C359S559000

Reexamination Certificate

active

06907124

ABSTRACT:
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 φ (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 φc(Xm, Ym) to the encoded phase value φ (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 φd(Xd, Yd) and the decrypting amplitude value ad(Xd, Yd) respectively, of a modulator resolution element (Xd, Yd) being substantially equal to −φc(Xm, Ym) and ac−1(Xm, Ym).

REFERENCES:
patent: 5148316 (1992-09-01), Horner et al.
patent: 5903648 (1999-05-01), Javidi
patent: 6011874 (2000-01-01), Gluckstad
patent: A4073790 (1992-03-01), None
patent: A1-9634307 (1996-10-01), None
Javidi, Physics Today, vol. 50, No. 3, pp. 27-32 (1997).

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