In this work, a real-time embedded system for chaosChaos-based audio encryptionAudio encryption is presented. The system is composed of a master and a slave microcontrollerMicrocontroller design, with a microphone connected to the master microcontrollerMicrocontroller. The approach consists of two steps: converting the audio signal to a binary sequence, and then performing an XOR operation using a pseudo-random bit sequence derived from a chaotic map. The main results include the usage of the Taylor expansion analogue of a 1D chaotic map for lower computational cost and higher encryption/decryption speeds, and the implementation on a low-cost STM32 microcontrollerMicrocontroller for cost-effective high-level security. Several tests, including the log-likelihood ratio, entropy, correlation coefficient, and spectral distortion, prove the encryption scheme’s security. The end result is a safe and agile system optimized for sequential real-time encryption and transmission.