The popularization of 5G and the development of cloud computing further promote the application of images. The storage of images in an untrusted environment has a great risk of privacy leakage. This paper outlines a design for a lightweight image encryption algorithm based on a message-passing algorithm with a chaotic external message. The message-passing (MP) algorithm allows simple messages to be passed locally for the solution to a global problem, which causes the interaction among adjacent pixels without additional space cost. This chaotic system can generate high pseudorandom sequences with high speed performance. A two-dimensional logistic map is utilized as a pseudorandom sequence generator to yield the external message sets of edge pixels. The external message can affect edge pixels, and then adjacent pixels interact with each other to produce an encrypted image. A MATLAB simulation shows the cipher-image performs fairly uniform distribution and has acceptable information entropy of 7.996749. The proposed algorithm reduces correlation coefficients from plain-image 1 to its cipher-image 0, which covers all of the plain-image characters with high computational efficiency (speed = 18.200374 Mbit/s). Theoretical analyses and experimental results prove the proposed algorithm’s persistence to various existing attacks with low cost.

中文翻译：

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基于消息传递和混沌映射的轻量级图像加密算法

5G的普及和云计算的发展进一步促进了图像的应用。在不受信任的环境中存储图像有很大的隐私泄露风险。本文概述了一种基于带有外部消息混乱的消息传递算法的轻量级图像加密算法的设计。消息传递（MP）算法允许将简单消息传递给本地，以解决全局问题，从而解决了相邻像素之间的交互，而不会产生额外的空间成本。该混沌系统可以生成具有高速性能的高伪随机序列。二维逻辑图用作伪随机序列生成器，以生成边缘像素的外部消息集。外部消息会影响边缘像素，然后相邻像素彼此交互以生成加密图像。MATLAB仿真显示，密码图像表现出相当均匀的分布，并且具有可接受的7.996749信息熵。所提出的算法将相关系数从纯图像1减少到其密码图像0，从而以较高的计算效率（速度= 18.200374 Mbit / s）覆盖了所有纯图像字符。理论分析和实验结果证明了该算法对各种现有攻击的持久性，且成本低廉。它以高计算效率（速度= 18.200374 Mbit / s）覆盖了所有纯图像字符。理论分析和实验结果证明了该算法对各种现有攻击的持久性，且成本低廉。它以高计算效率（速度= 18.200374 Mbit / s）覆盖了所有纯图像字符。理论分析和实验结果证明了该算法对各种现有攻击的持久性，且成本低廉。