Crossword Puzzle Attack on NLS

  title={Crossword Puzzle Attack on NLS},
  author={Joo Yeon Cho and Josef Pieprzyk},
  booktitle={IACR Cryptology ePrint Archive},
NLS is one of the stream ciphers submitted to the eSTREAM project. We present a distinguishing attack on NLS by Crossword Puzzle (CP) attack method which is newly introduced in this paper. We build the distinguisher by using linear approximations of both the non-linear feedback shift register (NFSR) and the nonlinear filter function (NLF). Since the bias of the distinguisher depends on the Konst value, which is a key-dependent word, we present the graph showing how the bias of distinguisher… CONTINUE READING
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