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Faulty LFSR - InCTF Internationals 2020

ph03n1x
2020-08-02
Crypto / LFSR

tl;dr

  1. Find the co-relation between variables in the LFSR equation
    1. d == out (75%)
    2. a == b (75%)
    3. c^d == out (75%)
    4. (d!= out) => (c==1) always
  2. Solve for the seed using 2000 output bits
  3. Try out which among the four possible combinations decrypt the flag
Read More
InCTFi LFSR Correlation attack

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