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Proceedings Paper

Fully phase encrypted memory using cascaded extended fractional Fourier transform
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Paper 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.

Paper Details

Date Published: 23 October 2003
PDF: 8 pages
Proc. SPIE 5202, Optical Information Systems, (23 October 2003); doi: 10.1117/12.503966
Show Author Affiliations
Naveen Kumar Nishchal, Indian Institute of Technology Delhi (India)
Joby Joseph, Indian Institute of Technology Delhi (India)
Kehar Singh, Indian Institute of Technology Delhi (India)


Published in SPIE Proceedings Vol. 5202:
Optical Information Systems
Bahram Javidi; Demetri Psaltis, Editor(s)

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