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Data security

Secure Communication in Millimeter-Wave Radio-Over-Fiber Systems

Strategic Insights

— 2 min read

Researchers at Shanghai University have developed a novel secure communication scheme for millimeter-wave radio-over-fiber systems. The scheme, based on one-time-pad (OTP) encryption, uses a face image database to generate a random encryption key for each frame. The system was experimentally demonstrated to achieve a high data rate of 24 Gb/s over 25 km of standard single-mode fiber and a 1 m wireless link at 30 GHz. The study found that the encrypted signal had a bit error rate (BER) below the forward error correction (FEC) threshold, even when the input optical power exceeded -3.5 dBm.

Key Takeaways:

  • The proposed OTP scheme uses a face image database to generate a random encryption key for each frame, ensuring high security and resistance to various attacks.
  • The system achieved a high data rate of 24 Gb/s over 25 km of standard single-mode fiber and a 1 m wireless link at 30 GHz.
  • The study found that the encrypted signal had a bit error rate (BER) below the forward error correction (FEC) threshold, even when the input optical power exceeded -3.5 dBm.
  • The key space was calculated to be 10^308, effectively resisting various attacks.
  • Compared to traditional 3D chaotic encryption methods, the proposed scheme achieved a 0.5 dB improvement in receiver sensitivity.
  • The OTP scheme has significant potential for future applications in secure communication within millimeter-wave radio-over-fiber systems.
  • The research was funded by the National Natural Science Foundation of China (NSFC), the National Key Research & Development Program of China, and the Science & Technology Commission of Shanghai Municipality (STCSM).

Statistics:

  • 24 Gb/s: Data rate achieved in the experiment.
  • 25 km: Distance of the standard single-mode fiber used in the experiment.
  • 30 GHz: Frequency band used in the wireless link.
  • 1 m: Distance of the wireless link.
  • -3.5 dBm: Input optical power limit for maintaining a bit error rate (BER) below the FEC threshold.
  • 3.8 x 10^-3: FEC threshold for maintaining a reliable data transmission.
  • 10^308: Key space of the OTP scheme, indicating high resistance to attacks.
  • 0.5 dB: Improvement in receiver sensitivity compared to traditional 3D chaotic encryption methods.

Sources:

  • One-time Pad Scheme Based On Ofdm and Image for Mmw-rof System. Optics Communications, 2025; 592.
  • NewsRx. Findings from Shanghai University in Information and Data Encoding and Encryption Reported (One-time Pad Scheme Based On Ofdm and Image for Mmw-rof System). Information Technology Newsweekly. November 4, 2025; p 178.

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