As a medium that can convey information vividly, the application of digital images is increasingly widespread. Under various application environments, researchers are expected to provide more secure and efficient protection for digital images. In this paper, a novel image encryption scheme is proposed, which is based on non-adjacent parallelable permutation and dynamic DNA-level two-way diffusion (IES-NP-DDT). To achieve higher encryption efficiency, each encryption step of this scheme is designed with the parallelizability of operations in mind. Firstly, the plain image is logically divided into adjacent blocks and permutation blocks. And the permutation blocks are then randomly permutated in parallel by multiple computing units. Next, the permutated image is split and encoded into four DNA planes. When encoding each 2-bit plane, the computing units dynamically adopt encoding rules according to chaotic sequences. Combined with the dynamic DNA decoding, the excellent nonlinearity of the diffusion process is ensured. Finally, determined by the hash value, key components and chaotic values, various two-way DNA-level diffusions are carried out in parallel on the DNA planes. Consequently, a smallest change of any pixel is efficiently diffused to the whole image. Extensive simulation tests and theoretical analyses conducted in this paper have demonstrated the excellent performance of IES-NP-DDT.

作为一种能够形象地传达信息的媒介，数字图像的应用越来越广泛。在各种应用环境下，研究人员有望为数字图像提供更安全、更高效的保护。本文提出了一种基于非相邻并行排列和动态DNA级双向扩散（IES-NP-DDT）的新型图像加密方案。为了实现更高的加密效率，该方案的每个加密步骤在设计时都考虑了操作的可并行性。首先，将普通图像在逻辑上划分为相邻块和置换块。然后排列块由多个计算单元并行随机排列。接下来，置换后的图像被分割并编码为四个 DNA 平面。在对每个 2 位平面进行编码时，计算单元根据混沌序列动态采用编码规则。结合动态DNA解码，保证了扩散过程的良好非线性。最后，由哈希值、关键分量和混沌值决定，在DNA平面上并行进行各种双向DNA级扩散。因此，任何像素的最小变化都有效地扩散到整个图像。本文进行的大量模拟测试和理论分析证明了 IES-NP-DDT 的优异性能。各种双向 DNA 水平扩散在 DNA 平面上并行进行。因此，任何像素的最小变化都有效地扩散到整个图像。本文进行的大量模拟测试和理论分析证明了 IES-NP-DDT 的优异性能。各种双向 DNA 水平扩散在 DNA 平面上并行进行。因此，任何像素的最小变化都有效地扩散到整个图像。本文进行的大量模拟测试和理论分析证明了 IES-NP-DDT 的优异性能。