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Journal of Optics A Pure and Applied Optics

Encrypted ultra-fast image transmission using an OTDM/WDM scheme

Tsuyoshi Konishi, Yoshinori Oshita, Kazuyoshi Itoh, Yoshiki Ichioka

Published Aug 21, 2003• 1 citation
Publisher

Abstract

We propose an encryption process in ultra-fast image transmission using an OTDM/WDM scheme. We use a spatial time–frequency transform filter for time-to-2D-space conversion as a secret key. The simulation of this encryption process and preliminary experiments are demonstrated. It is shown that the security strength of this method increases exponentially as the number of pixels increases.

DOI
10.1088/1464-4258/5/5/393

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We propose an encryption process in ultra-fast image transmission using an OTDM/WDM scheme. We use a spatial time–frequency transform filter for time-to-2D-space conversion as a secret key. The simulation of this encryption process and preliminary experiments are demonstrated. It is shown that the security strength of this method increases exponentially as the number of pixels increases.
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In the digital era, the security of image data has become increasingly important. This study aims to develop an image encryption scheme based on Quantum Key Distribution (QKD) and Fractional Fourier Transform (FRFT) to enhance the security of image data transmission and storage. The proposed scheme first utilizes QKD to generate and distribute secure encryption keys, ensuring the unconditional security of the key distribution process. Subsequently, FRFT is employed to perform complex transformations on the image data, using fractional order parameters to achieve multi-scale representation of the image in both time and frequency domains, thereby increasing the complexity and security of the encryption process. Experimental results demonstrate that this scheme exhibits significant advantages in terms of the quality of encrypted images and their resistance to attacks. Specifically, the encrypted images possess high Peak Signal-to-Noise Ratio (PSNR) and Structural Similarity Index (SSIM), effectively resisting various attacks. Comparative analysis further verifies the superiority of this scheme in terms of security and efficiency. In summary, the proposed combination of QKD and FRFT for image encryption holds great potential and research value in the protection of image data.
As an important information medium, the digital image exists widely on the Internet. Quantum walks have the property of encrypting information. For the eneryption problem of optical digital images, an encryption scheme based on discrete cosine transform (DCT) and alternate quantum walks (AQW) is proposed in this paper. First, we use AQW and XOR operation to preprocess images in the spatial domain. Then, AQW are used to generate two random phase masks which can operate the preprocessed image and the DCT image, respectively. Finally, the encrypted image is obtained by using discrete cosine inverse exchange. The control parameters of AQW can replace the random phase mask as the key in the encryption and decryption process, so it is convenient for key management and transmission. The experimental simulation carried out the analysis of the image pixel histogram, the correlation of adjacent pixels, the robustness against noise and the sensitivity of secret keys, the results show that the image encryption method has strong security.