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An asymmetric hybrid cryptosystem using equal modulus and random decomposition in hybrid transform domain

机译:在混合变换域中使用等模和随机分解的非对称混合密码系统

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摘要

In this paper, an asymmetric hybrid cryptosystem with coherent superposition, equal modulus and random decomposition in hybrid transform domain is proposed. To further strengthen the security of the cryptosystem, a hyperchaotic system is used as a pixel-swapping procedure. The hybrid transform is generated by utilizing fractional Fourier transform of various orders and Walsh transform. The hyperchaotic framework's parameters and starting conditions alongside the fractional orders of the fractional Fourier transform extend the key-space and consequently give extra strength to the proposed cryptosystem. The designed cryptosystem has an extended key-space to avoid any brute-force attack and is non-linear in nature. The scheme is validated on gray-scale images. Computer based simulations have been performed to verify the validity and the performance of the proposed cryptosystem against different types of attacks. Results demonstrate that the proposed cryptosystem not only offers higher protection against noise attacks but is also invulnerable to special attack.
机译:本文提出了一种在混合变换域中具有相干叠加,等模数和随机分解的非对称混合密码体制。为了进一步增强密码系统的安全性,使用超混沌系统作为像素交换过程。混合变换是通过利用各种阶数的分数阶傅里叶变换和Walsh变换生成的。超混沌框架的参数和起始条件以及分数阶傅里叶变换的分数阶扩展了密钥空间,因此为拟议的密码系统提供了额外的优势。设计的密码系统具有扩展的密钥空间,可以避免任何暴力攻击,并且本质上是非线性的。该方案在灰度图像上得到验证。已经进行了基于计算机的仿真,以验证所提出的密码系统针对不同类型的攻击的有效性和性能。结果表明,所提出的密码系统不仅可以提供更高的抗噪声攻击保护,而且不受特殊攻击的影响。

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