Hint:

magic_eye.dat 50 — I’m pretty sure it’s a schooner - magic_eye-e5a34090f3a6fe71248e30720132aaad

The file is a corrupted PNG file.

The solution is the following:

• Open the file using pypng.

• Extract the data from the IDAT chuck.

• Decompress the extracted data with gzip.zlib.

• Flag is at the end of the text.

The solution code is:

{language=python}

 1 #!/usr/bin/env python
 2 
 3 import png
 4 import gzip
 5 
 6 image = png.Reader("./magic_eye-e5a34090f3a6fe71248e30720132aaad")
 7 
 8 preamble = image.preamble()
 9 (t, d) = image.chunk()
10 
11 print(gzip.zlib.decompress(d))

Flag: some_flag_goes_here