Advertisement
Published in:
2018 | OriginalPaper | Chapter
Asymmetric Cryptosystem Using Affine Transform in Fourier Domain
Authors : Savita Anjana, Indu Saini, Phool Singh, A. K. Yadav
Published in: Advanced Computational and Communication Paradigms
Publisher: Springer Singapore
Activate our intelligent search to find suitable subject content or patents.
Select sections of text to find matching patents with Artificial Intelligence. powered by
Select sections of text to find additional relevant content using AI-assisted search. powered by
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.