OOO archive --- DEF CON CTF [ login ]

dc2021q - back-to-qoo crypto

by tiffanyb

This was a jeopardy challenge, part of dc2021q. (CTFtime)

This challenge was represented as 💸
Points: 128
Was solved by: 43 teams

You may spawn the server:

On your laptop
  • Install docker
  • docker pull archiveooo/pub:back-to-qoo (docker-saved download)
  • docker run -d --name back-to-qoo archiveooo/pub:back-to-qoo
  • Local IP: docker inspect back-to-qoo -f '{{ .NetworkSettings.Networks.bridge.IPAddress }}'
  • Connect to that IP:5000 — Remember to docker rm -f when done.
On your laptop (full source)
  • Install docker and pip install PyYAML coloredlogs
  • git clone
  • cd back-to-qoo
  • ./spawner --log-level=INFO
  • Connect to the ip:port displayed
Hosted by OOO Right now we're asking players to login first.


You are pulled back to QOO again. QOO or OOO? Whatever.

line_weight line_weight line_weight line_weight line_weight


None yet :(
If you wish, you can contribute some.

There's an author-recommended writeup.


Spoilers ahead! Code for this challenge is publicly available.