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hyper-chaos encryption using convolutional masking and model free unmasking

Chinese Physics B 2014年第5期23卷 161-166页

作者：齐国元 Sandra Bazebo Matondo Department of Electrical Engineerin Tshwane University of Technology Pretoria

In this paper, during the masking process the encrypted message is convolved and embedded into a qi hyper-chaotic system characterizing a high disorder degree. The masking scheme was tested using both qi hyper-chaos and Lorenz chaos and indicated that qi hyper-chaos based masking can resist attacks of the filtering and power spectrum analysis, while the Lorenz based scheme fails for high amplitude data. To unmask the message at the receiving end, two methods are proposed. In the first method, a model-free synchronizer, i.e. a multivariable higher-order differential feedback controller between the transmitter and receiver is employed to de-convolve the message embedded in the receiving signal. In the second method, no synchronization is required since the message is de-convolved using the information of the estimated derivative.

关键词： qi hyper-chaos masking high-order differentiator chaos-based encryption

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hyper-Chaotic Cryptosystem Using Model-free synchronization

Hyper-Chaotic Cryptosystem Using Model-free synchronization

引用

2012 Fifth International Workshop on chaos-Fractals Theories and Applications

作者： Guoyuan qi Sandra Bazebo Matondo Department of Electrical Engineering Tshwane University of Technology Pretoria

In this paper a hyper-chaotic cryptosystem is proposed based on two encryption processes: the image substitutionpermutation cryptography process followed by masking of the ciphered image. In the substitution-permutation cryptography process, the selective encryption using exclusive or operation is performed in the frequency domain, and the image is further encrypted in the spatial domain using the permutation encryption rule and keys generated by the qi hyper-chaotic system. The ciphered image is changed into a time varying series which is fed into the hyper-chaotic transmitter as a driving signal. The unmasking process is proposed based on a model-free multivariable high order differential feedback controller used to synchronize the driven and the response systems of our scheme. Analysis and result have shown that the model-free controller offers a robust synchronization and the two encrypting processes for image increase the image security.

关键词： qi hyper-chaos selective encryption pseudo random numbers sorting shuffling masking multivariable higher order differential feedback controller

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