Solution to EkoParty 2020 Pre-CTF Challenge - Anon
This group es too paranoid http://paste.ubuntu.com/p/HnGHwGk4rQ/
There is a pastebin with more URLs inside to others pastebin (if is not deleted) and so on... You must navigate through all the pastebin to get the flag key, I did it with a Python script. The flag is encrypted with Base64.