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arXiv 1409.5491cs.CR
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使用AES和可变排列的图像加密

Images encryption using AES and variable permutations

V. M. Silva-García, R. Flores-Carapia, C. Rentería-Máarquez, B. Luna-Benoso, C. A. Jiménez Vázquez

摘要:

这项工作提出了一种不同的程序来加密图像的256灰度级和颜色,使用对称系统高级加密标准与变量置换在第一轮,在X-或操作后。可变置换意味着对每个128位的输入块使用不同的置换。在这方面,构造了一种算法,其定义了集合Nm = {n in N,0 <= n < fac(m)}(其中n >= 2)和Pm = {pi,pi是0,1,.,m-1}。该算法计算128个位置上的置换,其中127个已知常数。超越数用于以伪随机方式选择127个常数。建议的加密质量通过以下标准进行评估:相关性;水平,垂直和对角,熵和离散傅立叶变换。后者使用NIST标准800-22。此外,还对加密数字进行了敏感性分析。此外,提出了一个额外的测试,它考虑了三种颜色的256个阴影的分布;红色,绿色和蓝色的彩色图像。另一方面,重要的是要提到,图像是加密的,没有信息丢失,因为许多银行公司和一些安全区国家不允许数字经过压缩过程,信息丢失。也就是说,禁止使用JPEG等格式。

英文摘要:

This work proposes a different procedure to encrypt images of 256 grey levels and colour, using the symmetric system Advanced Encryption Standard with a variable permutation in the first round, after the x-or operation. Variable permutation means using a different one for each input block of 128 bits. In this vein, an algorithm is constructed that defines a Bijective function between sets Nm = {n in N, 0 <= n < fac(m)} with n >= 2 and Pm = {pi, pi is a permutation of 0, 1, ..., m-1}. This algorithm calculates permutations on 128 positions with 127 known constants. The transcendental numbers are used to select the 127 constants in a pseudo-random way. The proposed encryption quality is evaluated by the following criteria: Correlation; horizontal, vertical and diagonal, Entropy and Discrete Fourier Transform. The latter uses the NIST standard 800-22. Also, a sensitivity analysis was performed in encrypted figures. Furthermore, an additional test is proposed which considers the distribution of 256 shades of the three colours; red, green and blue for colour images. On the other hand, it is important to mention that the images are encrypted without loss of information because many banking companies and some safety area countries do not allow the figures to go through a compression process with information loss. i.e., it is forbidden to use formats such as JPEG.

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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