DEF CON CTF 2021 QUALS

Quals were held online, 48 hours, starting at UTC 00:00 May 1st (CTFtime).

We have also released most challenges to our archive, and challenge authors are starting to release their code on github.

The scoreboard (including solves information) is archived at scoreboard2021.oooverflow.io

Itching to know what other players tried and how they reached the flag? PCAPs are available for {baby mama gran}-a-fallen-lap-ray, cozen (~280 GB), exploit-for-dummies, mooosl, mra, nooombers, nooopster, pooow-{buddy pal}, qoo-or-ooo, back-to-qoo, rick, segnalooo, threefactooorx, tiamat.

Final scoreboard

Pre-qualifiers

Only the world’s top teams make it to DEF CON. This enables the event to explore the cutting edge of the amazing things that the world’s hackers are capable of. But the trick, of course, is figuring out who these hackers are. In CTF, this is done through cut-throat competition.

Every year, the DEF CON CTF organizers select a number of prominent events in the CTF community as prequalifiers. The winner of each of these is automatically invited by the Order of the Overflow to compete in DEF CON CTF, and OOO completes the roster by selecting teams through our own qualification round (see above) as well as last year’s DEF CON champion.

We select pre-qualifying events according to several considerations. We always look for quality events that present a variety of interesting challenges to their participants. We look for both prominent events with an established history and promising up-and-comers. And we have an additional metric: connecting the various global hacker communities. We want qualifiers not only to represent quality and innovation, but also to enable DEF CON to be a place where top hackers from the different worldwide hacker communities come together!

To that end, the Order of the Overflow has selected the following events as pre-qualifiers:

HITCON CTF 2020 - 28–29 November 2020 - prequalified: Perfect ⚔️ Guesser aka SuperGuesser / SuperBlue / PerfectBlue
hxp CTF 2020 - 18–20 December 2020 - prequalified: pasten
PlaidCTF 2021 - 16–18 April 2021 - prequalified… the same team as HIT CON!
pwn2win - May 28-30 - prequalified: DiceGang

Additionally, teams will prequalify through the following DEF CON events:

DEF CON 2020 CTF Finals - 9 August 2020 - prequalified: A*0*E
DEF CON 2021 CTF Qualifiers - see above

From these events, we will identify the top hackers in the CTF community, invite them to DEF CON, and watch them battle it out at DEF CON 29. See you there!

In case you missed it: sixteen teams will be invited to the finals: “crypto” msg