Welcome, hackers of all ages.
The call for 2021 prequalifiers is out and the date for quals is set!
Keep an eye on our Twitter account for prequalifier announcements.
Also, we launched a playable archive of our past challenges! See you on archive.ooo (Info)
Who are we?
We are the Order of the Overflow. We are the current host of DEF CON CTF (Quals and Finals). Read about us and our philosophy here or reach us at team@oooverflow.io.
Follow @oooverflow on Twitter for updates!
DEF CON CTFs
- DEF CON CTF 2021 Quals –> UTC 00:00 May 1st!
- DEF CON CTF 2020 Finals
- DEF CON CTF 2020 Quals
- DEF CON CTF 2019 Finals
- DEF CON CTF 2019 Quals
- DEF CON CTF 2018 Finals
- DEF CON CTF 2018 Quals
Public Sources
We owe thanks to many people -- some are listed here