Tian Peiran, Su Runzhou
Department of Physics, College of Science, Northeast Forestry University, Harbin 150040, China.
Sensors (Basel). 2022 Jul 16;22(14):5325. doi: 10.3390/s22145325.
The double random phase encoding (DRPE) system plays a significant role in encrypted systems. However, it is a linear system that leads to security holes in encrypted systems. To tackle this issue, this paper proposes a novel optical image encryption scheme that combines a chaotic S-box, DRPE, and an improved Arnold transformation (IAT). In particular, the encryption scheme designs a chaotic S-box to substitute an image. The chaotic S-box has the characteristics of high nonlinearity and low differential uniformity and is then introduced to enhance the security of the DRPE system. Chaotic S-boxes are resistant to algebraic attacks. An IAT is used to scramble an image encoded by the DRPE system. Meanwhile, three chaotic sequences are obtained by a nonlinear chaotic map in the proposed encryption scheme. One of them is used for XOR operation, and the other two chaotic sequences are explored to generate two random masks in the DRPE system. Simulation results and performance analysis show that the proposed encryption scheme is efficient and secure.
双随机相位编码（DRPE）系统在加密系统中起着重要作用。然而，它是一个线性系统，会导致加密系统出现安全漏洞。为了解决这个问题，本文提出了一种新颖的光学图像加密方案，该方案结合了混沌S盒、DRPE和改进的阿诺德变换（IAT）。具体而言，该加密方案设计了一个混沌S盒来替代图像。混沌S盒具有高非线性和低差分均匀性的特点，随后被引入以增强DRPE系统的安全性。混沌S盒能抵抗代数攻击。IAT用于对由DRPE系统编码的图像进行置乱。同时，在所提出的加密方案中，通过非线性混沌映射获得三个混沌序列。其中一个用于异或运算，另外两个混沌序列用于在DRPE系统中生成两个随机掩码。仿真结果和性能分析表明，所提出的加密方案高效且安全。
