$ cat writeup.md…
$ cat writeup.md…
broncoctf2026
Task: intercepted transmission of space-separated emoji pairs plus an image of a face with 5 header emojis and a faint 5x5 character grid. Solution: title 'Emojibius' = Emoji + Polybius; header emojis index rows/cols of a 5x5 Polybius square whose cells are the grid characters, each pair (row,col) looks up a character.
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$sign in$ grep --similar