Asymmetric optical cryptosystem with secret-key sharing based on coherent superposition and normalized decomposition: Asymmetric optical cryptosystem with secret-key sharing based on coherent: M. G. Abdelfattah et al.
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| Title: | Asymmetric optical cryptosystem with secret-key sharing based on coherent superposition and normalized decomposition: Asymmetric optical cryptosystem with secret-key sharing based on coherent: M. G. Abdelfattah et al. |
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| Authors: | Abdelfattah, Mohamed G.1 (AUTHOR) eng.mo.gamal@mans.edu.eg, Hegazy, Salem F.2 (AUTHOR) salem@niles.cu.edu.eg, Obayya, Salah S. A.1,3 (AUTHOR) sobayya@zewailcity.edu.eg |
| Source: | Optical & Quantum Electronics. Feb2025, Vol. 57 Issue 2, p1-20. 20p. |
| Subjects: | Spatial light modulators, Random noise theory, Optical interferometers, Fourier transforms, Statistical correlation |
| Abstract: | In this paper, we present an asymmetric optical cryptosystem that performs multiple image encryption (MIE) featured with a secret image sharing (SIS) attribute, which holds significant potential for various security applications. The system is based on a novel normalized decomposition algorithm that breaks down the spectrum of each plain image into a set of M phase-only masks (POMs). Among these masks, one is unified and shared across all images, serving as the cipher image, while (M - 1) masks are unique to each image and act as the corresponding secret key for that image. This approach enables the sharing of the (M - 1) secret phase-only keys among authorized users, thereby enhancing the access security. To realize the MIE-SIS cryptosystem, a compact optical system is presented that employs Mach-Zehnder interferometer and spatial light modulators (SLMs) charged by POMs. The silhouette problem is completely resolved by applying a chaotic random amplitude mask (CRAM) to the image spectrum prior to the decomposition process. Numerical experiments verify the effective integrity of the MIE-SIS cryptosystem. Even a small deviation of 0.02 rad in any of the decomposed POMs results in a correlation coefficient value of less than 0.015, indicating high sensitivity to the phase keys. The results prove the unlimited encryption capacity of the MIE-SIS cryptosystem and demonstrate its robustness against Gaussian noise and statistical attacks. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | In this paper, we present an asymmetric optical cryptosystem that performs multiple image encryption (MIE) featured with a secret image sharing (SIS) attribute, which holds significant potential for various security applications. The system is based on a novel normalized decomposition algorithm that breaks down the spectrum of each plain image into a set of M phase-only masks (POMs). Among these masks, one is unified and shared across all images, serving as the cipher image, while (M - 1) masks are unique to each image and act as the corresponding secret key for that image. This approach enables the sharing of the (M - 1) secret phase-only keys among authorized users, thereby enhancing the access security. To realize the MIE-SIS cryptosystem, a compact optical system is presented that employs Mach-Zehnder interferometer and spatial light modulators (SLMs) charged by POMs. The silhouette problem is completely resolved by applying a chaotic random amplitude mask (CRAM) to the image spectrum prior to the decomposition process. Numerical experiments verify the effective integrity of the MIE-SIS cryptosystem. Even a small deviation of 0.02 rad in any of the decomposed POMs results in a correlation coefficient value of less than 0.015, indicating high sensitivity to the phase keys. The results prove the unlimited encryption capacity of the MIE-SIS cryptosystem and demonstrate its robustness against Gaussian noise and statistical attacks. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 03068919 |
| DOI: | 10.1007/s11082-025-08061-y |
