Fully phase encrypted memory using cascaded extended fractional Fourier transform

Naveen Kumar Nishchal; Joby Joseph; Kehar Singh

doi:10.1117/12.503966

23 October 2003 Fully phase encrypted memory using cascaded extended fractional Fourier transform

Naveen Kumar Nishchal, Joby Joseph, Kehar Singh

Proceedings Volume 5202, Optical Information Systems; (2003) https://doi.org/10.1117/12.503966
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

In this paper, we implement a fully phase encrypted memory system using cascaded extended fractional Fourier transform (FRT). We encrypt and decrypt a two-dimensional image obtained from an amplitude image. The fully phase image to be encrypted is fractional Fourier transformed three times and random phase masks are placed in the two intermediate planes. Performing the FRT three times increases the key size, at an added complexity of one more lens. The encrypted image is holographically recorded in a photorefractive crystal and is then decrypted by generating through phase conjugation, conjugate of encrypted image. The decrypted phase image is converted into an amplitude image by using phase contrast technique. A lithium niobate crystal has been used as a phase contrast filter to reconstruct the phase image, alleviating the need of alignment in the Fourier plane, thereby making the system rugged.

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Naveen Kumar Nishchal, Joby Joseph, and Kehar Singh "Fully phase encrypted memory using cascaded extended fractional Fourier transform", Proc. SPIE 5202, Optical Information Systems, (23 October 2003); https://doi.org/10.1117/12.503966

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KEYWORDS

Image encryption

Crystals

Phase contrast

Phase conjugation

Lithium niobate

Fractional fourier transform

Computer programming

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