RED, RED, RED, RED
Download the image: red.png
This challenge gives us RED.png which is just a red square in an image file. Because it’s a png file, we can use zsteg to search the image for any steganography hidden in RED.png.
The first line of text is a very heartfelt poem which was probably meant to be sent to someone else. But we aren’t here for that, because there’s a Base64 encoded string which we can decode in the next line!
The flag is: picoCTF{r3d_1s_th3_ult1m4t3_cur3_f0r_54dn355_}