基于离散四元数傅里叶变换的双随机相位加密技术

应用光学图像加密的思想，将离散四元数傅里叶变换(DQFT)与双随机相位加密技术相结合，提出了一种应用于彩色图像的双随机相位加密新技术. 基于DQFT的双随机相位加密技术可将彩色图像作为一个整体进行加密，从而在保持了系统的保密性能的同时，有效地降低了复杂性. 阐述了加密和解密的原理，并通过实验对其鲁棒性进行了验证.关键词：四元数离散四元数傅里叶变换(DQFT)双随机相位加密

Doubled random-phase encryption based on discrete quaternion fourier-transforms

In this paper, a new method for color-image encryption using discrete quaternion fourier-transforms (DQFT) combined with doubled random-phase encryption as used in the optical implementation is proposed, by which color images can be processed as a whole, rather than as separated color components in three channels, so that the complexity of the encryption system can be effectively reduced without any reduction in its security. The principle of both encryption and decryption is detailed and the robustness of the system has been examined experimentally.