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<p>In this paper, we propose a multi-image encryption technique based on Gaussian aperture gyrator wavelet transform (GWT) through QR decomposition and optical scanning holography (OSH). The proposed Gaussian aperture GWT tool serves as a soft aperture to refine the intensity distribution. Initially, multiple images are preferentially preprocessed by Gaussian aperture GWT followed by QR decomposition encryption scheme, which is transformed into a hologram using OSH. Through the proposed scheme, during decryption, the information leakage can be controlled effectively. Since QR decomposition results into amplitude function, it is susceptible to attacks. Therefore, OSH is implemented such that final encrypted image results into a complex hologram. The use of orthogonal matrix keys, gyrator transform orders, and the parameters of the wavelet transform bring more ulterior distribution to the ciphertext. The use of OSH and a combination of keys make the system attack free like brute force attack, known plaintext attack, and special attack. Also, the proposed structure has the ability of resisting occlusion attack.</p>

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Securing multiple images using Gaussian aperture gyrator wavelet transform through QR decomposition and optical scanning holography

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Isha Mehra,
  • Naveen K. Nishchal

摘要

In this paper, we propose a multi-image encryption technique based on Gaussian aperture gyrator wavelet transform (GWT) through QR decomposition and optical scanning holography (OSH). The proposed Gaussian aperture GWT tool serves as a soft aperture to refine the intensity distribution. Initially, multiple images are preferentially preprocessed by Gaussian aperture GWT followed by QR decomposition encryption scheme, which is transformed into a hologram using OSH. Through the proposed scheme, during decryption, the information leakage can be controlled effectively. Since QR decomposition results into amplitude function, it is susceptible to attacks. Therefore, OSH is implemented such that final encrypted image results into a complex hologram. The use of orthogonal matrix keys, gyrator transform orders, and the parameters of the wavelet transform bring more ulterior distribution to the ciphertext. The use of OSH and a combination of keys make the system attack free like brute force attack, known plaintext attack, and special attack. Also, the proposed structure has the ability of resisting occlusion attack.