Abstract
In this paper, a nonlinear optical image encryption scheme using a phase retrieval algorithm (PRA) and phase-truncated Fourier transform (PTFT) is proposed. In the scheme, the standard grayscale image is initially encoded into the phase function by using the PRA, which is scrambled by using the pixel scrambling transform and then decomposed digitally into the sign and the amplitude distributions at the Fourier plane. This step increases nonlinearity and complexity of the optical encryption process. The amplitude distribution is processed to produce the ciphertext using the PTFT operation, and the sign distribution is encoded as a binary key. In the system, the encryption keys as the random phase mask (RPM) keys are employed. For decrypting the information, the decryption keys in terms of the binary key and the phase-only mask key are used. Since the encryption keys and the decryption keys are entirely different, the proposed system satisfies the criteria of traditional cryptography. In this work, several operations such as pixel scrambling transform and its inverse are digitally performed, therefore, the proposed system can be suitably implemented using the hybrid optical-digital approach. Numerical-based simulations have been performed to validate the performance and security of the proposed scheme. Simulation results show that the proposed system extends higher security and is robust to different types of attacks.
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Verma, G. Nonlinear image encryption based on phase truncation and phase retrieval operation. J Opt (2023). https://doi.org/10.1007/s12596-023-01499-x
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DOI: https://doi.org/10.1007/s12596-023-01499-x