1.1 KiB
unseen
The main idea finding the flag is using LSB bit and steghide tools.
Step-1:
After I downloaded nyc.png & morse.wav, I tried basic binwalk and strings, but obviously it didn't work.
Step-2:
I tried to decode morse.wav online here.
Step-3:
This message gave me idea that I have to search further in image only. Using the LSB hint from the description, I found the string 42845193 at 1-bit LSB.
Step-4:
Using Steghide tool, I tried to extract data from the morse.wav by command steghide extract -sf morse.wav
Passphrase was 42845193
It gave me this output:
wrote extracted data to "flag.txt".
Step-5:
Something to work on. So when I opened flag.txt. It was blank with space, tabs and newline. So I tried to decode that using Whitespace Decoder at : https://vii5ard.github.io/whitespace/
Voila! I had the flag there.
Step-6:
Finally the flag becomes:
csictf{7h47_15_h0w_y0u_c4n_83c0m3_1nv151813}