Abstract
An improved image encryption scheme that uses affine transform and asymmetric keys in Fourier transform domain has been proposed. The scheme is validated for grayscale images through numerical simulation using MATLAB 7.14. In the proposed scheme, the decryption keys are different from the encryption keys and are obtained by phase truncation Fourier transform method. The performance of the scheme is evaluated in terms of the metrics such as correlation coefficient, mean-squared error, and peak signal-to-noise ratio. We have carried out the sensitivity analysis relative to the affine transform parameter, which serves as an additional security feature. The robustness of the scheme is demonstrated by showing its resistance against noise and occlusion attacks. Since this is the first study that uses affine transform in the phase-truncated Fourier transform based asymmetric cryptosystem, it provides a new scheme for image encryption with enhanced security.
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Anjana, S., Saini, I., Singh, P., Yadav, A.K. (2018). Asymmetric Cryptosystem Using Affine Transform in Fourier Domain. In: Bhattacharyya, S., Chaki, N., Konar, D., Chakraborty, U., Singh, C. (eds) Advanced Computational and Communication Paradigms. Advances in Intelligent Systems and Computing, vol 706. Springer, Singapore. https://doi.org/10.1007/978-981-10-8237-5_4
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DOI: https://doi.org/10.1007/978-981-10-8237-5_4
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