Abstract
Many image encryption techniques have been designed based on block based transformation techniques or chaos based algorithms. In this paper, a two stage image encryption technique is proposed. In the first stage, a new method of generating orthonormal matrices is presented and used along with sparse matrices to generate key matrices which are used to transform the original image. Since, chaos based encryption techniques are very efficient due to sensitivity to initial conditions and system parameters, this paper makes an analytical study of some recent chaos based image encryption techniques. In the second stage, the image is encrypted using one of the studied algorithms which has an optimal balance between robustness and execution time. This transformation is very fast and the overall cryptosystem is very robust which can be observed from entropy analysis, resistance to statistical and differential attacks and large key space.
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Chhotaray, A., Biswas, S., Chhotaray, S.K., Rath, G.S. (2016). An Image Encryption Technique Using Orthonormal Matrices and Chaotic Maps. In: Nagar, A., Mohapatra, D., Chaki, N. (eds) Proceedings of 3rd International Conference on Advanced Computing, Networking and Informatics. Smart Innovation, Systems and Technologies, vol 44. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2529-4_37
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DOI: https://doi.org/10.1007/978-81-322-2529-4_37
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