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A Secure Transmission Scheme Based on Artificial Fading for Wireless CrowdSensing Networks.

Zhi-Jiang Xu1,2,3, Fang-Ni Chen4,5, Yuan Wu6

  • 1Zhijiang College, Zhejiang University of Technology, Shaoxing 312030, China. zyfxzj@zjut.edu.cn.

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Summary

This study introduces a physical layer security scheme for wireless crowdsensing networks. The proposed method encrypts data using a Rayleigh-distributed random key, ensuring secure communication for legitimate users while thwarting eavesdroppers.

Keywords:
artificial fadingchaotic sequencephysical layer securitywireless crowdsensing networks

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Area of Science:

  • Wireless Communications
  • Network Security
  • Signal Processing

Background:

  • Wireless crowdsensing networks require secure data transmission from low-cost, single-antenna nodes.
  • Existing security methods may not be suitable for resource-constrained environments.
  • Physical layer security offers a promising approach for enhancing security at the transmission level.

Purpose of the Study:

  • To propose a novel physical layer communication scheme for secure data transmission in wireless crowdsensing networks.
  • To develop a method for encrypting and decrypting data using a self-generated random key.
  • To evaluate the security and performance of the proposed scheme against eavesdropping.

Main Methods:

  • A physical layer security scheme is proposed for single-antenna nodes in static channel wireless crowdsensing networks.
  • Digital modulated symbols are encrypted using a complex random variable (random key) generated from a synchronized chaotic sequence and a two-stage block interleaver.
  • The complex random variable's envelope follows a Rayleigh distribution, and its phase is uniformly distributed, mimicking channel fading for encryption and decryption.

Main Results:

  • The bit error ratio (BER) performance for legitimate users matches the theoretical Rayleigh fading channel.
  • Eavesdroppers face an extremely high BER (approximately 0.5), rendering information interception infeasible.
  • The scheme effectively secures low-cost communication nodes without compromising legitimate user performance.

Conclusions:

  • The proposed physical layer security scheme provides robust protection against eavesdropping in wireless crowdsensing networks.
  • The encryption technique effectively utilizes channel-like properties to secure transmissions.
  • This approach is suitable for low-cost, single-antenna nodes operating under static channel conditions.