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<p>This paper presents a novel hybrid cryptosystem planned for securing multimedia speech signals, leveraging the complex dynamics of spatiotemporal chaotic systems. The proposed scheme integrates a Nonlinear Chaotic Algorithm (NCA) map with a Chaotic Matrix Operation for Randomization or Encryption (C-MORE) and XOR-based diffusion to achieve robust encryption of speech data. As a multimedia security tool, the system ensures high computational efficiency while providing strong cryptographic properties essential for real-time voice applications such as secure voice-over-IP, multimedia conferencing, and confidential audio messaging. Experimental results demonstrate that our proposed cryptosystem has large key space in range 2<sup>373</sup> and extreme sensitive to key changes. Also, generated chaotic bit sequences successfully approved all NIST SP 800–22 statistical tests evaluations. Differential attack analysis demonstrates that proposed encryption method yields NSCR and UACI values of 99.6159 and 33.3190, respectively. These results are notably close to the ideal values. Decrypted speech quality metrics include <i>SNR</i>=121.56 <i>dB</i>, <i>SNR</i><sub>seg</sub> = 122.31 <i>dB</i> and <i>PRD</i> = 0.001516 which proves that the original speech signal can be recovered exactly. By examining the numerical simulation results, it can be concluded that the proposed approach offers a practical and secure multimedia encryption tool suitable for integration into contemporary communication and multimedia systems.</p>

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Design and security analysis of a chaotic hybrid cryptosystem for multimedia speech signals

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Behrouz Vaseghi,
  • Somayeh Hashemi,
  • Saleh Mobayen

摘要

This paper presents a novel hybrid cryptosystem planned for securing multimedia speech signals, leveraging the complex dynamics of spatiotemporal chaotic systems. The proposed scheme integrates a Nonlinear Chaotic Algorithm (NCA) map with a Chaotic Matrix Operation for Randomization or Encryption (C-MORE) and XOR-based diffusion to achieve robust encryption of speech data. As a multimedia security tool, the system ensures high computational efficiency while providing strong cryptographic properties essential for real-time voice applications such as secure voice-over-IP, multimedia conferencing, and confidential audio messaging. Experimental results demonstrate that our proposed cryptosystem has large key space in range 2373 and extreme sensitive to key changes. Also, generated chaotic bit sequences successfully approved all NIST SP 800–22 statistical tests evaluations. Differential attack analysis demonstrates that proposed encryption method yields NSCR and UACI values of 99.6159 and 33.3190, respectively. These results are notably close to the ideal values. Decrypted speech quality metrics include SNR=121.56 dB, SNRseg = 122.31 dB and PRD = 0.001516 which proves that the original speech signal can be recovered exactly. By examining the numerical simulation results, it can be concluded that the proposed approach offers a practical and secure multimedia encryption tool suitable for integration into contemporary communication and multimedia systems.