ctftime

My solutions for various CTF challenges

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One of my friends like to hide data in images.

Help me to find out the secret in image.

stego.jpg

Analyse metadata of image with exiftool and extract the thumbnail image with:

$ exiftool -b -ThumbnailImage stego.jpg > image.jpg

It contains a QR code, the decoded content is the flag.

$ zbarimg thumbnail.jpg

flag: d4rk{flAg_h1dd3n_1n_th3_thumbnail}c0de