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CTF writeups

DownUnderCTF 2020: Bad man

Bad man

200 points

Author: n00bmaster

We have recently received reports about a hacker who goes by the alias und3rm4t3r. He has been threatening innocent people for money and must be stopped. Help us find him and get us the flag.


I've found und3rm4t3r profile ( One of the tweets seems interesting:

So, I've checked the wayback machine for a snapshot ( and found the flag :-)


DownUnderCTF 2020: Pretty Good Pitfall

Pretty Good Pitfall

200 points

Author: k0wa1ski#6150

PGP/GPG/GnuPG/OpenPGP is great! I reckon you can't find the message, because it looks scrambled!

Attached files: flag.txt.gpg (sha256: dad03ac28b7294c8696eeac21d11159c3dcfc8ed226438804fe82b4fb9f6ad87)


gpg --output doc flag.txt.gpg


DownUnderCTF 2020: Addition


200 points

Author: n00bmaster

Joe is aiming to become the next supreme coder by trying to make his code smaller and smaller. His most recent project is a simple calculator which he reckons is super secure because of the "filters" he has in place. However, he thinks that he knows more than everyone around him. Put Joe in his place and grab the flag.


Ok, so we've got a webpage with calculator and a hint it's written in python.

I've found the flag using this payload '{}'.format(open('','r').read())