A Six-Dimensional Hyperchaotic Pseudorandom Sequence for Enhanced Voice Encryption

• Published in: Ingénierie des systèmes d'Information Vol. 28; no. 4; pp. 1055 - 1062
• Main Authors: Haseeb, Enas Hamza, Kadhim, Sana Ahmed, Mahmood, Ali Shakir
• Format: Journal Article
• Language: English; French
• Published: Edmonton International Information and Engineering Technology Association (IIETA) 01.08.2023
• Subjects: Algorithms; Audio data; Chaos theory; Confidentiality; Correlation coefficients; Cryptography; Data encryption; Eigenvalues; Entropy; Equilibrium; Image enhancement; Initial conditions; Multimedia; Noise sensitivity; Parameter sensitivity; Pseudorandom sequences; Security; Sensitivity analysis; Signal to noise ratio; Speech; Voice communication; Wavelet transforms
• ISSN: 1633-1311; 2116-7125
• DOI: 10.18280/isi.280425

Over recent decades, the demand for robust voice encryption algorithms has escalated to fortify the security of speech transmission over vulnerable channels such as the internet. Among the myriad of available methodologies, those underpinned by chaos theory have garnered significant attention due to their inherent pseudorandomness, acute sensitivity to initial conditions, and control parameters. These attributes render them capable of encrypting a variety of data types, encompassing but not limited to videos, images, and audio. This study presents a novel voice encryption approach predicated on a six-dimensional (6D) hyperchaotic system. In the proposed method, six unique keys are generated from the 6D hyperchaotic system. The initial three keys are employed to permute the human voice signal, while the subsequent trio is engaged in the diffusion process. The efficacy of this scheme is evaluated on several parameters: Mean Square Error (MSE), Signal-To-Noise Ratio (SNR), correlation coefficient, Peak Signal-To-Noise Ratio (PSNR), key sensitivity, key space, and entropy analysis. The Libri-Speech dataset serves as the test bench for the proposed system. The key space has been determined to be 2465. The system's performance is notable, with correlation coefficients ranging between -0.00276 and 0.002759, entropy values from 14.74399 to 14.74942, PSNR values from 4.2814 to 4.7875, SNR values from -30.3854 to -9.2364, and a nearly zero MSE range of 0.3321 to 0.3731 between original and extracted signals. This study underscores the potential of the 6D hyperchaotic system in enhancing information security, specifically for voice encryption. The findings may pave the way for more secure communication protocols in an increasingly interconnected digital world.