Wang Boyu, Su Yanfeng, Gao Ming, Lyu Hong, Zhang Jiayin, Zhou Bei, Zhong Wenqi, Zhang Peng, Li Yinghong
School of Opto-Electronical Engineering, Xi'an Technological University, Xi'an, 710021, China.
College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China.
Sci Rep. 2025 Mar 25;15(1):10264. doi: 10.1038/s41598-025-94320-7.
In this paper, a color image encryption method based on finger vein key and off-axis digital holography with phase-modulated reference light is proposed. In the encryption process, firstly the channel separation operation is performed on the color plaintext image, and the "red", "green" and "blue" channels grayscale data of the color plaintext image are obtained respectively. Subsequently, the finger vein quantum matrix of the encryption user is generated through the quantum matrix generation program and used as the scrambling index key, mask key, and phase mask keys in the next encryption steps. The grayscale data of each channel of the original color plaintext image is then encrypted using the DNA coding encryption operation, and these encrypted results are embedded into the carrier image, thus the encryption watermark image is obtained. After, the encryption watermark image is executed image encryption operation based on double random phase coding (DRPE) in the Fresnel transform domain, so that the encryption object light is obtained. Finally, the off-axis digital holography encoding technology (ODHE) with phase-modulated reference light is performed on encryption object light, so that the finally holographic ciphertext is generated. In the decryption process, the decryption user's finger vein must first be authenticated. If the authentication is successful, the system proceeds with the subsequent decryption steps, so that the correct decrypted color image can be obtained; otherwise, the decryption process is terminated. In order to demonstrate the feasibility of the proposed color image encryption method, a series of numerical simulations are performed, and the simulation results show that the proposed method exhibits high feasibility as well as high security level, large key space, contactless authentication, strong portability of ciphertext, strong robustness and security of finger vein key.
本文提出了一种基于手指静脉密钥和相位调制参考光离轴数字全息术的彩色图像加密方法。在加密过程中，首先对彩色明文图像进行通道分离操作，分别得到彩色明文图像的“红”“绿”“蓝”通道灰度数据。随后，通过量子矩阵生成程序生成加密用户的手指静脉量子矩阵，并将其用作后续加密步骤中的置乱索引密钥、掩码密钥和相位掩码密钥。然后，利用DNA编码加密操作对原始彩色明文图像各通道的灰度数据进行加密，并将这些加密结果嵌入到载体图像中，从而得到加密水印图像。之后，对加密水印图像在菲涅耳变换域中基于双随机相位编码（DRPE）执行图像加密操作，得到加密物光。最后，对加密物光执行相位调制参考光离轴数字全息编码技术（ODHE），生成最终的全息密文。在解密过程中，必须首先对解密用户的手指静脉进行认证。如果认证成功，系统进行后续解密步骤，从而得到正确解密的彩色图像；否则，解密过程终止。为了验证所提彩色图像加密方法 的可行性，进行了一系列数值模拟，模拟结果表明，该方法具有很高的可行性以及高安全级别、大密钥空间、非接触式认证、密文强便携性、手指静脉密钥强鲁棒性和安全性。
