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

作　　者：Zhao CHEN Liuguo YIN Yukui PEI Jianhua LU 

机构地区：[1]Department of Electronic Engineering, Tsinghua University, Beijing 100084, China [2]School of Aerospace. Tsinghua University, Beijing 100084,-China [3]Electronic Design Automation (EDA) Laboratory, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China

出　　处：《Science China(Information Sciences)》2016年第10期117-131,共15页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China (Grant No. 2013CB329001);National Natural Science Foundation of China (Grants Nos. 61132002, 61101072)

摘　　要：This paper proposes a novel scheme named CodeHop, which provides both information reliability and security using code hopping 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.This paper proposes a novel scheme named CodeHop, which provides both information reliability and security using code hopping 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.

关 键 词：physical layer security error correction data encryption low-density parity-check codes codehopping 

分 类 号：TN911.22[电子电信—通信与信息系统] TN925.93[电子电信—信息与通信工程]