Click here to try mission level 3
Look carefully: it's obvious, just not at first sight.
Thank you tiksi
- When you click into this challenge page, you will see a gray level image like above.
- Since the hint "Look carefully: it's obvious, just not at first sight." tells us to look carefully, let's use a hex editor to check it out!
- After we opened the image, we would discover there are some differences of the hex value in the content of the image.
- I replaced all the '3D' with 'FF' in the image, and after that we would find out the answer is displayed on the image
- Enter the password! It's done!