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arXiv 1709.07620cs.CR
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基于混沌动态S盒的数字图像替换方法

Chaotic Dynamic S Boxes Based Substitution Approach for Digital Images

Musheer Ahmad, Akshay Chopra

摘要:

提出了一种基于混沌、替换盒、伽罗瓦域非线性变换和拉丁方的图像加密算法。首先,动态S盒的产生采用Fisher Yates洗牌方法和分段线性混沌映射。该算法利用带密钥的拉丁方和变换的优点,替代高度相关的数字图像,得到具有较高性能的加密图像。利用Logistic映射实现混沌行为,该映射用于从千个S盒中选择一个S盒,并确定所选S盒的行和列。使用非线性变换来变换所选择的S盒值。连同使用256位外部密钥生成的加密拉丁方,用于在密码块链接模式中秘密地替换普通图像像素。为了进一步增强算法的安全性,采用了舍入运算来得到最终的图像。实验结果进行评估算法和预期的算法与最近的加密方案进行了比较。分析表明,算法的有效性,提供高安全性的数字媒体。

英文摘要:

In this paper, we propose an image encryption algorithm based on the chaos, substitution boxes, nonlinear transformation in Galois field and Latin square. Initially, the dynamic S boxes are generated using Fisher Yates shuffle method and piece wise linear chaotic map. The algorithm utilizes advantages of keyed Latin square and transformation to substitute highly correlated digital images and yield encrypted image with valued performance. The chaotic behavior is achieved using Logistic map which is used to select one of thousand S boxes and also decides the row and column of selected S box. The selected S box value is transformed using nonlinear transformation. Along with the keyed Latin square generated using a 256 bit external key, used to substitute secretly plain image pixels in cipher block chaining mode. To further strengthen the security of algorithm, round operation are applied to obtain final ciphered image. The experimental results are performed to evaluate algorithm and the anticipated algorithm is compared with a recent encryption scheme. The analyses demonstrate algorithms effectiveness in providing high security to digital media.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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