Quaternion-Oriented Multistructure Attractor: Generation and Audio Encryption Application With Hardware Implementation

With the widespread application of audio communication in the internet of things, secure and efficient audio data transmission has become increasingly critical. However, existing chaos-based encryption schemes often face challenges in flexibly generating complex chaotic attractors and achieving a practical balance between security, flexibility, and efficiency. To address these limitations, this paper proposes a novel universal method for generating multi-structure chaotic attractors based on a quaternion rotation matrix transformation. This method enables flexible control over the position, scale, and number of wing units in attractors by configuring quaternion parameters and multi-level pulse function. Building upon this, we design a high-performance chaos-based audio encryption algorithm, and implement an encryption system for wireless transmission using a microcontroller and LoRa module. The system integrates audio recording, encryption, wireless transmission, and decryption. Comprehensive security analyses demonstrate the proposed algorithm achieves robust performance. The successful integration of flexible chaotic attractor design, robust cryptographic security, and hardware realization confirms the practical viability of our scheme for information transmission in resource-constrained environments.