stegoPromedium
Stickers (9ff6401f-2c68-4b01-a557-5d01fe1e3954)
hackerlab
Task: GIF file with corrupted header (first 6 bytes zeroed) and hidden sticker pack. Solution: Restore GIF89a header, extract frames, discover frames 10-12 have larger dimensions (600x600 vs 512x512), extract flag from green channel in the hidden canvas area below 512px.
$ ls tags/ techniques/
steganographygreen_channelframe_extractiongifanimated_gifcorrupted_headerresolution_mismatchhidden_canvasimage_forensics
GIF header repair (corrupted magic bytes)Frame-by-frame resolution analysisHidden canvas area extraction (beyond visible dimensions)Color channel separation (green channel)
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