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To score, any future team must create a solution that is at least as “good” as that of the first team to solve the challenge.Īs time passes and the threshold changes, the challenge becomes inherently easier.When they submit this flag, the threshold is locked.

When a team submits a solution that satisfies the threshold, they receive the challenge flag.

For example, the threshold might increase by 1 every ten minutes, so after an hour, a shellcode that fails on 6 bitflips would solve the challenge.

After the grace period, the threshold begins to slowly tick up, on a per-challenge rate.

After the service launches, there is a grace period where the threshold remains unchanged.

When launched, the challenge would have a threshold of 0 failed bitflips: to solve the challenge, a team would have to craft a shellcode that could survive any single bitflip in any position.

If The Bitflip Conjecture was deployed as a golf challenge, it might work like this: The sooner they solve it, the more difficult it remains, the harder it is for other teams to catch up, and the more points it will be worth.Ĭan you keep those points out of the hands of your competition?Īs an example, let’s look at how a King of the Hill ⛰️ challenge from DEF CON 27 Finals, The Bitflip Conjecture (writeups here, here, and here), where teams scored based on how many different bitflips their crafted shellcode survived. In a golf challenge, teams race against time to solve a challenge that’s gradually degrading in difficulty. This year, the Order of the Overflow is excited to introduce a new style of CTF challenge: golf ⛳. What if they could also dictate the difficulty 🤔? Speedrun challenges added a twist by letting the top teams dictate awarded points by beating each other to the punch. Last year, we challenged you with an entire category of speedruns 🏎️: bite-size problems designed for hacking races.

New this year: GOLF CHALLENGES 🏌️‍♀️ 🏌️‍♂️ ⛳ IN CTF We’ll sort out the details as soon as we can. We will, however, host some form of final event! This means that there will not be an in-person final event in Las Vegas. There! What will DEF CON 28 CTF Finals look like?Īs you might have heard, DEF CON 28 will be done in Safe Mode. Invite them to DEF CON, and watch them battle it out at DEF CON 28. Non-qualified teams (N will be crypto-committed before the qualifiers begin)įrom these events, we will identify the top hackers in the CTF community, DEF CON 2020 CTF Qualifiers - will qualify top N.DEF CON China’s BCTF 2020 - cancelled due to COVID.DEF CON 2019 CTF Finals - 19 August 2019 - prequalified: PPP.CTFZone 2020 - Prequalified: More Smoked Leet ChickenĪdditionally, teams will prequalify through the following DEF CON events:.HITCON CTF 2019 - Prequalified: Tea Deliverers.CodeBlue CTF 2019 - Prequalified: Cykor.To that end, the Order of the Overflow has selected the following events as pre-qualifiers: Qualifiers not only to represent quality and innovation, but also to enable DEFĬON to be a place where top hackers from the different worldwide hacker We look for both prominent events with an established Look for quality events that present a variety of interesting challenges to We select pre-qualifying events according to several considerations. Qualification round (scheduled this year for March 27th!) as well as last The winner of each of these isĪutomatically invited by the Order of the Overflow to compete in DEF CON CTF,Īnd the OOO completes the roster by selecting teams through our own In CTF, this is done through cut-throat competition.Įvery year, the DEF CON CTF organizers select a number of prominent events in But the trick, of course, is figuring out who these hackers are. This enables the event toĮxplore the cutting edge of the amazing things that the world’s hackers areĬapable of. Only the world’s top teams make it to DEF CON. Check out Sirgoon and our friends at Hack-A-Sat, who provided guest challenge interrupted.To try out challenges, simply spawn service/Dockerfile – you may also use our helper scriptīabymaze biooosless blursed bytecoooding coooppersmith cursed dogooos fungez interrupted introool keml lifebooox mamamaze maybe nooopsled notbefoooled ooo-flag-sharing ooobash ooofs ooonline-class ooonline-gradclass supersafecalc whooo-are-u (and its helper endpoint).Open-source releases on github/o-o-overflow.The quals spanned 2 days, starting from May 16th UTC.įor a little while, we may still chat on DEF CON’s official discord (CTF area). DEF CON CTF 2020 QUALS Quals are finished, congrats A*O*E!