Data security plays a significant role in data transfer in cloud-based smart cities. Chaotic maps are commonly used in designing modern cryptographic applications, in which one-dimensional (1D) chaotic systems are widely used due to their simple design and low computational complexity. However, 1D chaotic maps suffer from different kinds of attacks because of their chaotic discontinuous ranges and small key-space. To own the benefits of 1D chaotic maps and avoid their drawbacks, the cascading of two integrated 1D chaotic systems has been utilized. In this paper, we report an image cryptosystem for data transfer in cloud-based smart cities using the cascading of Logistic-Chebyshev and Logistic-Sine maps. Logistic-Sine map has been utilized to permute the plain image, and Logistic-Chebyshev map has been used to substitute the permuted image, while the cascading of both integrated maps has been utilized in performing XOR procedure on the substituted image. The security analyses of the suggested approach prove that the encryption mechanism has good efficiency as well as lower encryption time compared with other related algorithms.

中文翻译：

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在基于云的智能城市环境中通过简单的置换替换机制保护数字图像的安全

数据安全性在基于云的智能城市中的数据传输中起着重要作用。混沌图通常用于设计现代密码学应用程序，其中一维（1D）混沌系统由于其简单的设计和较低的计算复杂性而被广泛使用。但是，一维混沌图由于其不连续的不连续范围和较小的键空间而遭受不同类型的攻击。为了拥有1D混沌图的优点并避免其缺点，已利用两个集成的1D混沌系统的级联。在本文中，我们报告了使用Logistic-Chebyshev和Logistic-Sine地图的级联在基于云的智能城市中进行数据传输的图像密码系统。已使用Logistic-Sine映射来置换普通图像，并使用Logistic-Chebyshev映射来置换置换后的图像，而两个集成图的级联已被用于对替代图像执行XOR程序。所提方法的安全性分析证明，与其他相关算法相比，该加密机制具有较高的效率和较低的加密时间。