Multi-image asymmetric encryption algorithm based on phase truncation and pixel scrambling in the gyrator domain

This manuscript proposes a multi-image security algorithm based on phase truncation and pixel scrambling in the gyrator domain. The algorithm utilizes chaotic maps to improve key strength and phase truncation to provide asymmetric nature to the proposed algorithm. These features make proposed algorithm secure encryption algorithms for multiple images simultaneously. The algorithm utilized affine chaotic map for pixel scrambling. The proposed algorithm is tested with different types of images. The efficacy and robustness of proposed algorithm is tested through statistical and visual attacks such as correlation coefficient, information entropy, mean squared error, peak signal-to-noise ratio, histogram, mesh and correlation distribution plots. Efficacy of proposed algorithm is also analysed using the contamination and cryptographic attack such as known plaintext, chosen plaintext, and brute force attack. Results show that proposed algorithm is robust and secure to use in real-time applications.