stegohard

BinaryChess

grodno_new_year_2026

Task: Chess steganography challenge with a PGN file containing 66 moves encoding hidden binary data. Solution: Applied the WintrCat/chessencryption algorithm, extracting bits from each move's index in the sorted list of legal moves (log2(N) bits per move), concatenating them into bytes to reveal the flag.

$ ls tags/ techniques/
steganographybinary_encodingchesspgnmove_index
chess_steganographylegal_move_indexingbit_extraction
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