Optical Double-image Cryptosystem Based on Phase-truncated Using Random Modulus Decomposition and Polar Decomposition

Abstract

This paper presents a new optical double-image encryption and decryption method by combining encryption scheme based on phase-truncated with spatial encoding, random modulus decomposition, and polar decomposition. In this scheme two plaintext images are encrypted into a single ciphertext by three public keys, along with five private keys. The method is designed to enhance the security of data from tampering and unauthorized access. To assess their effectiveness, extensive simulations and analyses were carried out under different conditions. The flexibility of this approach was assessed by examining its response to noise attacks or blockages, demonstrating its strength and reliability. Additionally, statistical analysis has been performed to highlight the impact of key parameters on system performance. Comparative evaluations with existing techniques indicate superior performance in term of robustness, silhouette problem and resistance to attacks. The results confirm that even slight variations in these parameters significantly influence the decryption process, further reinforcing the security of the proposed method.