Optical audio cryptosystem using hyperchaotic implementation in Gyrator domain

Abstract

Some reported audio encryption methods are inefficient, their anti-differential attack capabilities are subpar, and using a pseudo-random number generator in a singular chaotic system results in diminished security, gradually revealing additional issues. This paper proposes a novel optical audio cryptosystem based on the Gyrator (GT) transform and a hyperchaotic system. The proposed algorithm involves merging chaos theory with conventional cryptographic techniques to create an optical encryption algorithm that aligns better with the properties of digital audio. To enhance security, the hyperchaotic system generates various hyperchaotic states involved in the disruption process. Subsequently, Random Mode Decomposition (RMD) is employed to generate two asymmetric independent vectors, leading to the acquisition of the ciphertext and private key. During the decryption phase, the ciphertext and private key are transferred into the input plane of the GT transform. Indeed, the suggested cryptographic system is apt for authenticating messages, as hyperchaotic data is essential for encryption and decryption techniques. A series of attack experiments have demonstrated the efficacy and capability of the cryptosystem.