steg

Description

Yes, it's been there on the homepage all this time.

https://ctf.uwaterloo.ca/

Stegosaurus Rex

From the title "steg" I automatically think of steganography

Steganography - Method of hiding information within seemingly ordinary mediums, such as images, to avoid detection

We go to the website and play around, inspecting elements for potential hidden flags. Eventually, something catches my eye:

UW CTF Club · GitLabGitLab

Their GitLab is linked 👀

This houses all the code for the UW CTF website. We can see a very telling commit name

"Chall"? "Background"? Oho!

Checking out the commit, we can see an image file change

There must be something very peculiar about the new image 🤔

I would use Photoshop if I had it. Unfortunately, the only image software I know how to use is MS Paint. Instead, let's try some online websites

Aperi'Solve

One of the images produced shows the flag, albeit very hard to read

Flag

uwctf{stegfrthistime_9b0a89e16a81af67}