Esher

-$ cd ..

For this challenge, we received the following image:

esher image

The trick in this case was to use a website to be able to see the text hidden in the 3D image. After to upload the image to the website we need to proceed a 90° rotation to the left.

result esher

We extract this URL: bit.ly/2TuD8Zp.

This page redirected us to the following address https://cybersecuritychallenge.be/prefinals/1dedf46e93ff4de7bf254e30d38fbebd2e25d2eb6038bb78df81ac9274b69afd.txt.

We could also download the file and the flag was in the file: CSCBE{BetterStereoscopyThanColonoscopy}.