New Codes with Finite Length for a Wiretap Channel

  • Authors:

  • Sunghwan Kim

  • Affiliations:

  • School of Electrical Engineering, University of Ulsan, Ulsan, Korea 680-749

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2014

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Abstract

In this paper, an equivocation scheme with finite code length is proposed for a wiretap channel. The proposed coding scheme is composed of two constituent codes, an outer code and an inner code, which are used efficiently for various channel conditions. A Hamming code and its cosets are used for an outer code and bit-extension mapping is adopted for an inner code. The average equivocation is discussed for small messages and the probability of causing imperfect secrecy is defined to investigate the performance of outer and inner codes. The results show that usage of inner codes increases the equivocation capability of wiretap channels.