Lightweight chaos-based cryptosystem for secure images

Zeinab Fawaz, S. E. Assad, M. Frajallah, Ayman Khalil, R. Lozi, O. Déforges
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引用次数: 2

Abstract

In the last two decades, several chaos-based cryptosystems have been proposed. Some of them have architecture comprising a layer of permutation and a layer of diffusion and these layers are simultaneously executed in a simple scan of plain-image pixels. In this kind of cryptosystems, due to the channel effect, a bit error(s) in the cipher-image produces, at the decryption side, a random bit error in the estimated plain-image. In this paper, we propose a cipher-block encryption algorithm in CBC (Cipher Block Chaining) mode. It consists of a permutation process on the bits achieved by a 2D-cat map, followed by a bitwise XOR operation. Here, each permuted bit (confusion phase) is immediately diffused in a simple manner in the same phase. Therefore, the confusion and diffusion effects are stronger and the cryptanalyses for permutation-only ciphers become ineffective.
用于安全图像的轻量级基于混沌的密码系统
在过去的二十年中,已经提出了几种基于混沌的密码系统。其中一些具有包含排列层和扩散层的结构,并且这些层在简单的普通图像像素扫描中同时执行。在这类密码系统中,由于信道效应,在解密端,加密图像中的一个比特误差会在估计的明文图像中产生一个随机比特误差。本文提出了一种基于CBC (Cipher Block Chaining)模式的密码块加密算法。它包括对2D-cat映射获得的位进行排列过程,然后是逐位异或操作。在这里,每个置换比特(混淆相位)都以一种简单的方式在同一相位中立即扩散。因此,混淆和扩散效应更强,纯置换密码的密码分析变得无效。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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