Ma Yulin, Li Nachuan, Zhang Wenbin, Wang Shumei, Ma Hongyang
Opt Express. 2021 Aug 30;29(18):28338-28351. doi: 10.1364/OE.431945.
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.
作为一种重要的信息媒介，数字图像在互联网上广泛存在。量子游走具有信息加密的特性。针对光学数字图像的加密问题，本文提出了一种基于离散余弦变换（DCT）和交替量子游走（AQW）的加密方案。首先，我们使用AQW和异或运算在空间域对图像进行预处理。然后，利用AQW生成两个随机相位掩模，分别对预处理后的图像和DCT图像进行操作。最后，通过离散余弦逆变换得到加密图像。AQW的控制参数在加密和解密过程中可以替代随机相位掩模作为密钥，便于密钥管理和传输。实验仿真对图像像素直方图、相邻像素相关性、抗噪声鲁棒性和密钥敏感性进行了分析，结果表明该图像加密方法具有较强的安全性。
