New image encryption combining fractional DCT via polynomial interpolation with dependent scrambling and diffusion

被引：3

作者：

Yaru, Liang ^{[1
]}

Jianhua, Wu ^{[2
]}

机构：

[1] School of Mechatronic Engineering, Nanchang University, Nanchang

[2] School of Information Engineering, Nanchang University, Nanchang

来源：

Journal of China Universities of Posts and Telecommunications | 2015年 / 22卷 / 05期

基金：

中国国家自然科学基金;

关键词：

fractional discrete cosine transform (DCT); image diffusion; image encryption; image scrambling; polynomial interpolation; preservation of reality;

D O I：

10.1016/S1005-8885(15)60673-2

中图分类号：

学科分类号：

摘要：

Based on the fractional discrete cosine transform (DCT) via polynomial interpolation (PI-FrDCT) and the dependent scrambling and diffusion (DSD), an image encryption algorithm is proposed. Under certain conditions, the introduction of PI-FrDCT reduces computational complexity compared with fractional DCT (FrDCT). By using a sigmoid function, the encrypted results are limited within a range from 0 to 255. The real-valued output of PI-FrDCT is beneficial to the storage, display and transmission of the cipher-text. During the stage of confusion and diffusion, the values of all PI-FrDCT coefficients change simultaneously as their locations are replaced. DSD enhances the scrambling and diffusion level of encrypted images and provides nonlinearity to the encryption system. Simulation results demonstrate that the proposed encryption algorithm is feasible, effective and secure. © 2015 The Journal of China Universities of Posts and Telecommunications.

引用

页码：1 / 9

页数：8

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