Problem: Can you find the robots? https://2019shell1.picoctf.com/problem/45102/ (link) or http://2019shell1.picoctf.com:45102
Solution: Going to the link you are greeted with a black page asking where are the robots.
Looking at the page source you’ll find nothing. So where do any sites deal with robots? The robots.txt
Typing in https://2019shell1.picoctf.com/problem/45102/robots.txt
You’ll see something Disallow: /8e32f.html check that out.
Guess you found the robots
picoCTF{ca1cu1at1ng_Mach1n3s_8e32f}
And there’s the flag.
Flag: picoCTF{ca1cu1at1ng_Mach1n3s_8e32f}