JXL

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Flag format: CTF{...}

Did you hear about JPEG XL? This image can check your flag!

Try:

sudo apt install libjxl-tools
djxl flag.jxl flag.png
xdg-open flag.png

Edit the top of the original image (ASCII-encoded flag bits) so that the image verifies the flag as correct... however weird it sounds.

I would recommend an editor for this task, but as far as I know, nothing really supports JXL enough... so hexeditor, I guess?

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