Information security system by iterative multiple-phase retrieval and pixel random permutation.

Full Abstract

A novel information security system based on multiple-phase retrieval by an iterative Fresnel-transform algorithm and pixel random permutation (PRP) technique is proposed. In this method a series of phase masks cascaded in free space are employed and the phase distributions of all the masks are adjusted simultaneously in each iteration. It can achieve faster convergence and better quality of the recovered image compared with double-phase encoding and a similar approach in the spatial-frequency domain with the same number of phase masks and can provide a higher degree of freedom in key space with more geometric parameters as supplementary keys. Furthermore, the security level of this method is greatly improved by the introduction of the PRP technique. The feasibility of this method and its robustness against occlusion and additional noise attacks are verified by computer simulations. The performance of this technique for different numbers of phase masks and quantized phase levels is investigated systematically with the correlation coefficient and mean square error as convergence criterions.

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Author information

Author/s: Meng, Xiang-Feng (XF); Cai, Lu-Zhong (LZ); Yang, Xiu-Lun (XL); Shen, Xiao-Xia (XX); Dong, Guo-Yan (GY);

Affiliation: Department of Optics, Shandong University, Jinan, China. lzcai(-atsign-)sdu.edu.cn

Journal and publication information

Publication Type: Journal Article

Journal: Applied optics (Appl Opt), published in United States. (Language: eng)

Reference: 2006-May; vol 45 (issue 14) : pp 3289-97

Dates: Created 2006/05/05; Completed 2006/07/07;

PMID: 16676034, status: PubMed-not-MEDLINE (last retrieval date: 12/26/2008)

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