We are given a .txt file :
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| xxkxxxxkdddddddddddddddccdcddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxcdddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxxxcdddddddddddddddddddcxxxxxxxxxxxxxxxxxccxxcdddddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxxxxcddddddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxcdddddddddddddddddcxxxxxxxxxxxxxxxxxcxxcddcdddddddddddddddddcxxxxxxxxxxxxxxxxxcxxxxxxcddddcdddddddddddddddddddcxxxxxxxxxxxxxxxxxcxccddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcddddddcddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxxxxcddddddddddddddddddddcxxxxxxxxxxxxxxxxxcxxcxxxxcdddddddddddddddddddddddcxxxxxxxxxxxxxxxxxcxcddcddddddddddddddddcxxxxxxxxxxxxxxxxxccdcddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcdddddcdddddddddddddddddcxxxxxxxxxxxxxxxxxcxcxcdddddddddddddddddddcxxxxxxxxxxxxxxxxxccdcddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcdddddcdddddddddddddddddcxxxxxxxxxxxxxxxxxccxxxxxcddddddddddddddddddddddcxxxxxxxxxxxxxxxxxcdcxxxxxxxcdddddddddddddddddddddddcxxxxxxxxxxxxxxxxxcxxcxxxxcdddddddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcdddddcdddddddddddddddddcxxxxxxxxxxxxxxxxxcxcxcdddddddddddddddddddcxxxxxxxxxxxxxxxxxcxxcxxxxcdddddddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcddcddddddddddddddddddddcxxxxxxxxxxxxxxxxxcxcxxxxxcdddddddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcdddcdddddddddddddddddddcxxxxxxxxxxxxxxxxxcxcxcdddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcddddddcddddddddddddddddcxxxxxxxxxxxxxxxxxccxxxxcdddddddddddddddddddddcxxxxxxxxxxxxxxxxxxxxxxcdddcdddddddddddddddddddcxxxxxxxxxxxxxxxxxcxxxxxxcddc
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After a short online search using the name of the challenge, we found that it was code in an esoteric language:
More precisely, it’s the XKCD variant of Deadfish.
Using dCode we get this sequence.
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| 110 101 103 113 104 101 131 173 122 60 104 137 120 110 61 123 110 61 116 107 137 61 123 137 64 127 63 123 60 115 63 175
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You can recognise numbers in octal base by passing them in ascii with dCode we get the flag.
HACKDAY{R0D_PH1SH1NG_1S_4W3S0M3}
