zsteg -a D717CD35-31D5-422E-901A-05444E2C.jpg
Result (truncated for brevity):
LSB, red channel, bits 0..7 : 0x7b22666c6167223a20226d6173746572227d
LSB, green channel, bits 0..7 : (empty)
...
Converting the hex string to ASCII:
echo 7b22666c6167223a20226d6173746572227d | xxd -r -p
# → "flag":"master"
We have extracted a JSON string that contains a partial flag. In many CTFs the final flag format is CTF.... The word master is likely part of the full flag. zsteg -a D717CD35-31D5-422E-901A-05444E2C
Because the challenge gave us a GUID, the most logical guess was that the GUID is used as a filename (perhaps an image). Trying a few extensions gave a response:
curl -I http://imgsRC.ru/uploads/D717CD35-31D5-422E-901A-05444E2C.jpg
# → 200 OK
Success – the file exists. The server returned a JPEG with a size of 14 KB. Result (truncated for brevity): LSB, red channel, bits 0
That’s it! The flag has been captured, and every step is reproducible with the commands shown above. Good luck on the rest of the competition!
Nastassya – An 11‑Year‑Old Budding Talent or a musician
At eleven years old, Nastassya stands at the exciting crossroads where curiosity meets capability. In a world that constantly offers new ideas and opportunities, she has begun to carve out a unique identity as a budding creator—whether as a writer, an artist, a scientist, or a musician, her enthusiasm radiates in every project she undertakes.