Challenge Description
Let’s begin by downloading the file using wget <link>.
buildings.png
The downloaded file, buildings.png looks like this. Doesn’t seem helpful in any way.
PicoCTF Hint: There is data encoded somewhere... there might be an online decoder
This may be hinting that this is a Steganography challenge.
Decoded Flag
Following the directions in the hint, I went to Google and searched “Online png decoder”, and tried using the top search result to see where it leads me.
Success
After putting the
building.pngfile as input and clicking “Decode”, the flag was displayed in the first line within the “Hidden message” space.
Flag
picoCTF{h1d1ng_1n_th3_b1t5}