$ cat writeup.md…
$ cat writeup.md…
bug-makers
Task: two PNG wooden boards — a 6x6 character grid and a mask with 6 transparent holes — encode a hidden message. Solution: recognize a rotating Cardan grille, detect holes via PNG alpha channel, read revealed cells across all 4 rotations (90deg CW transform (r,c)->(c,5-r)), then leet-decode.
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$sign in$ grep --similar