README.md

Fish

Challenge:

Oh, fish! My dinner has turned transparent again. What will I eat now that I can't eat that yummy, yummy, fish head, mmmmmm head of fish mm so good...

Solution:

We have what appears to be a completely transparent PNG:

Running pngcheck fish.png doesn’t reveal anything interesting and strings fish.png just yields garbage.

If we upload the image to StegOnline we don't see much. But when we switch to “Full Red” (or Green or Blue):

Now we can read our flag: actf{in_the_m0rning_laughing_h4ppy_fish_heads_in_th3_evening_float1ng_in_your_soup}.