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A Robust Image Encryption Method Based on Bit Plane Decomposition and Multiple Chaotic Maps

W. Auyporn and S. Vongpradhip
Department of Computer Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand
Abstract—Multimedia security is very important for multimedia communications over open network. For some applications, the highly robust image encryption approach is needed. This project aims to design a high security image encryption method, since the conventional encryption methods such as DES, AES, and RSA do not suit for image data because there are high correlations and redundancy among pixels in natural images. By using two concepts; bit plane decomposition and multiple chaotic maps, the proposed encryption scheme offers more robust encryption method that is suitable for image data. In the confusion stage of the encryption, the image data is decomposed into eight bit planes, and then each bit plane is permuted separately based on different chaotic map. After that, eight bit planes are recomposed and performed XOR operation with a generated random bit matrix in order to alter all pixel values completely. In diffusion stage, the image is diffused based on a new generated sequence, and performed XOR operation again with another random bit matrix before iterating the diffusion process. The performance of the proposed method is evaluated by using statistical, key space, and key sensitivity analysis. The results show that the proposed image encryption method is very secure and robust against different attacks.

Index Terms—image encryption, chaotic maps, confusion-diffusion type, image processing for security

Cite: W. Auyporn and S. Vongpradhip, "A Robust Image Encryption Method Based on Bit Plane Decomposition and Multiple Chaotic Maps," International Journal of Signal Processing Systems, Vol. 3, No. 1, pp. 8-13, June 2015. doi: 10.12720/ijsps.3.1.8-13
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