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Encrypted acoustical communication system using time reversal through a tunable sonic crystal.

Valeria Sol Gomez1,2, Ignacio Spiousas3,4, Manuel C Eguia1,4

  • 1Laboratorio de Acústica y Percepción Sonora (LAPSo), Universidad Nacional de Quilmes, Bernal, Buenos Aires 1876, Argentina.

The Journal of the Acoustical Society of America
|September 15, 2025
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Summary
This summary is machine-generated.

This study introduces a novel encrypted acoustic communication system using tunable sonic crystals and time-reversal techniques. It achieves high accuracy for secure data transmission up to 2.7 kbps.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Cryptography

Background:

  • Acoustic communication systems face challenges in security and data integrity.
  • Existing methods for secure data transmission may lack physical layer encoding.
  • Sonic crystals offer unique physical properties for manipulating sound waves.

Purpose of the Study:

  • To develop a secure acoustical communication system using a tunable sonic crystal.
  • To implement a physical key mechanism for encrypted data transmission.
  • To evaluate the performance of the proposed system in terms of accuracy and transmission rate.

Main Methods:

  • A tunable sonic crystal (SC) with rotatable columns was designed.
  • One-channel time-reversal (TR) technique was employed for spatial encoding.
  • Each message byte was encoded at one of 256 pulse reconstruction sites.
  • Impulse responses were recorded at specific grid locations for encoding.
  • The SC configuration served as the physical key for decoding.

Main Results:

  • The system successfully reconstructed messages with nearly 100% accuracy.
  • Transmission rates of up to 2.7 kilobits/s were achieved.
  • The SC configuration acted as a secure physical key for decoding.
  • Time-reversal focusing peaks were generated at correct sites for accurate decoding.

Conclusions:

  • The proposed system offers a secure and accurate method for acoustical communication.
  • The combination of sonic crystals and time-reversal provides a robust physical layer security.
  • This approach enables encrypted data transmission within the audible frequency range.