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CodeHop: physical layer error correction and encryption with LDPC-based code hopping

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Abstract

This paper proposes a novel scheme named CodeHop, which provides both information reliability and security using code hop ping based on low-density parity-check (LDPC) codes. In contrast to traditional systems that perform error correction and encryption at different layers, CodeHop combines these two operations into a single step at physical layer, such that each plaintext message is jointly encoded and encrypted by a hopping parity-check matrix. According to a pseudo-random number generator (PRNG), the hopping matrix may rapidly switch among a sequence of LDPC parity-check matrices, which is randomly generated by a structured-random protograph expanding technique. Simulations show that reliable communication can be achieved by CodeHop with good error-correcting performance. In the meantime, CodeHop may improve the security of traditional systems such as GSM. Taking the A5/1 stream cipher used in GSM as the PRNG, it is shown that CodeHop is resistant to existing chosen-plaintext attacks that break A5/1 cipher already. Moreover, the security of CodeHop will be enhanced in the presence of channel errors as well.

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Authors and Affiliations

  1. Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China

    Zhao Chen, Yukui Pei & Jianhua Lu

  2. School of Aerospace, Tsinghua University, Beijing, 100084, China

    Liuguo Yin

  3. Electronic Design Automation (EDA) Laboratory, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China

    Zhao Chen & Liuguo Yin

Authors
  1. Zhao Chen
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  2. Liuguo Yin
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  3. Yukui Pei
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  4. Jianhua Lu
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Correspondence to Liuguo Yin.

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Chen, Z., Yin, L., Pei, Y. et al. CodeHop: physical layer error correction and encryption with LDPC-based code hopping. Sci. China Inf. Sci. 59, 102309 (2016). https://doi.org/10.1007/s11432-015-5452-1

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  • DOI: https://doi.org/10.1007/s11432-015-5452-1

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