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DEF CON 29 CTF Quals are this Weekend!

DEF CON 29 CTF Flag image

Friendly DEF CON 29 CTF reminder - this weekend the mighty Order of the Overflow is hosting the Qualifier event! It’s not often that the path to glory comes into such sharp focus - be ready to meet your destiny. Godspeed to all of the teams who will be battling it out for 48 straight beginning UTC 00:00 May 1st. The information you need is at and @oooverflow, the courage you need has been inside you all along.

DEF CON 29 is closer than it has ever been. Just let yourself feel it.

The Eagle Has Not Landed!

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We've had some questions about our warrant canary, and we wanted to let everyone know that it was just an accidental reversion to the previous version during a site wide update. We're putting some measures in place to avoid this kind of confusion in the future, but rest assured, all is well, and no action has been taken against us!

DEF CON 29: The Plan So Far

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I am announcing this now because the longer we wait and gather data the harder it will be for everyone to make plans, so we are announcing our intentions to kick things off.

DEF CON 29 will be a hybrid conference, partially in-person, and partially online. DEF CON will not be a “normal” con, but more like DEF CON “Different.” The situation we face this year is unique and will require us to do things differently, simplify our plans, and in a fast-moving environment be flexible to change.

Read the rest of the Dark Tangent's DEF CON 29 Announcement

DEF CON China Party Archive is Live!

DEF CON China Party image

If you didn’t get to participate in the DEF CON China Party, we have your back. We’ve got a full archive of the presentations and music for you to browse through at your convenience. We can’t provide you the experience of seeing The Dark Tangent’s avatar zooming across the virtual skyline with his jetboots, but the rest of the experience is on tap for you. Enjoy, and pass it on.

DEF CON 29 Theme and Artwork Contest!

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It’s official. DEF CON season has arrived. DEF CON 29 will be happening this August in one form or another and that means it’s time to announce the theme!

The theme for DEF CON 29 is (imagine a drum roll here) ‘You Can’t Stop the Signal’.

The signal can be a few things. It’s the powerful force that draws DEF CON together as a community, across miles, across years, even in global lockdown. It can be the magnet that draws us to the people trying to solve the same puzzles we are, who want to learn how everything works as much as we do. And it’s how we instinctively know that the technology we live with can be better, and we are the ones to figure out how.

We’ve put together a style guide that lays out a bunch of our inspirations for this year, from visual aesthetic to music, to movies and books. We hope it inspires you in whatever you’re creating for DC29, and we hope it gives you the same powerful sense of community and possibility that we feel.

The style guide also governs the Art Contest, so if you're artistically inclined we hope you'll find a nugget or two in there to inspire your entries. We look forward to seeing what you come up with and we thank you for being the kind of amazing, unstoppable community that keeps us coming back.

DEF CON China Party!

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We’re proud to announce another live online event! We’re working with our partners at Baidu and hosting a full one-day DEF CON China Party. Join us on March 20 in a specially built XRspace VR environment for a full day of our famous style of fun with music, speakers, contests and an interview with legendary hacker Steve Wozniak.

We’ll be announcing more details as the day approaches, so keep an eye on the party page for updates. We hope you’ll be able to join us, even if you don’t have a VR setup. See you there!

DEF CON Movie Night - Matchstick Men!

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This week’s DEF CON Movie Night flick is Ridley Scott’s ‘Matchstick Men’. Great performances, beautiful cinematography and more than a little social engineering action.

Join us in the DEF CON Discord 8pm PST Saturday ( in the movie-night-text channel!

DEF CON 29 Call for Everything!

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DEF CON 29 approaches. It looms. Darn near impends. Be still, and you can hear it – the DEF CON Call for Everything ringing though the air.

The CfE is when DEF CON throws open the doors and invites everyone’s best proposals in for a visit. Speaking proposals, ideas for vilages, prospective demo labs, contests, trainings, music, art - literally everything. You write up all the delightful things you want to share with the community, and we find a way to bring the best of them to life at DEF CON.

The Call for Everything page lists all the ways you can participate in the creation of the next DEF CON, along with the relevant details and deadlines, including some new questions intended to get your thoughts on whether this year’s con should be in-person, online or some of both.

So visit the CfE page, read the guidelines, and get your best ideas together. Let’s DO this thing!

DEF CON Movie Night - Lo and Behold!

DEF CON Movie Night - Lo and Behold Movie poster image

This week's DEF CON Movie Night will be a YouTube simultaneous screening of a movie partially shot at DEF CON 23! It's the inimitable Werner Herzog's 'Lo and Behold, Reveries of the Connected World'. Herzog is the legendary documentary filmmaker of Grizzly Man' and 'Cave of Forgotten Dreams' and a literal half century of straight up mad moviemaking genius. He's also got a part in 'The Mandalorian', in case legendary documentaries aren't your jam.

Herzog's team came to DEF CON 23 looking for some footage of the frontiers of digital connection - this was the year of the Wired magazine Jeep hack where Charlie Miller and Chris Valasek shut down Andy Greenberg's Jeep from across the country. I personally may have wished more DEF CON footage survived the edit, it's a really interesting and unsettling look at the emerging world of constant, instantaneous interconnectivity.

Join us Saturday at 8pm PST in the DEF CON discord ( in the #movie-night-text channel!

Coming Soon! DEF CON China Party!

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The global pandemic of 2020 changed a lot of plans, and DEF CON was no exception. We couldn’t safely hold either of our planned in-person events, so we regretfully cancelled DEF CON 28 in Las Vegas and DEF CON China 2 in Beijing.

Fortunately, we’re a hacker community. We adapt. We reimagine. We find a way.

We created DEF CON Safe Mode, and held our first online conference. With that experience under our belt, we threw our first online New Year’s Eve party to ring in 2021.

Now we’re proud to announce another live online event, this time in VR! Along with our DEF CON China partners at Baidu we’ll be hosting a full one-day DEF CON party experience with contests, music and speakers, all in Virtual Reality.

We’ll be announcing the dates and details soon, so watch this space. We’ll also make sure you can check it out even without VR gear. Let’s make 2021 a year of increased friendship and connection for the global hacker community - no matter what conditions may come. We are hackers, and we find a way.

Hacking DEF CON with a Urinal Cake

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Very cool video about the kind of crazy effort people put in to the #defcon Badge Hacking contest. Spoofing the badge is always a mighty challenge - but this team went above and beyond.

#urinalcake #badgelife thanks to @alexchaveriat for making the video!

DEF CON Movie Night - Charade

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Movie Night 1-16 - 'Charade'

Let's all take a break from doomscrolling social media and treat ourselves to 90 or so minutes of the delightful effervescence of Audrey Hepburn, Cary Grant and Paris in the "lightly comedic mystery thriller" Charade. It's a beautifully shot film, with sparkling chemistry between the leads and a great score by Henry Mancini. You will be charmed.

8PM PST Saturday in the movie-night-text channel of Be there or be an equilateral rectangle.

Thanks for Hanging Out!

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Just a little note to thank everyone who came out to our New Year’s Eve Party! It was fun to hang out with so many of you, and very satisfying to ring in the New Year with our community.

These are difficult times for many of us, and maintaining our connections is an important part of staying healthy. Please feel free to visit for conversation, links to DEF CON Groups around the world and information about our upcoming events. We want you to stay safe, stay healthy and stay in touch.

DEF CON NYE Movie Night Takeover!


This week’s NYE edition of DEF CON’s Movie Night is being hosted by the Cult of the Dead Cow! The OG hacker supergroup will be in the movie night channel sharing a curated list of videos, telling tales and answering your questions.

If you know the Cult of the Dead Cow, you don’t need us to tell you how cool this is. If you don’t, just know they’ve been holding down the elite hacker strike force space since before you hacked your Teddy Ruxpin, and this is the perfect time to fill in that crucial gap in your grasp of hacker lore.

Follow us on and @defcon for times and video listings, and visit to see what the cult is up to now.

DEF CON NYE Music Lineup!

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DEF CON wants to be the soundtrack to your New Year’s Eve! Our party is packed with live DJ sets from all kinds of artists, both new and familiar. To get you familiar with the musical lineup in advance, we’ve got a list of the performers on the NYE Party Page!

Sample, evaluate and plan accordingly. Let's shake off 2020 together with some beat therapy.

DEF CON Awards at NYE Party!

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We're bringing back the #DEFCONAwards for the @defcon #NewYearsEve party! Nominations open now!

Voting on those nominations begins on the 28th. Nominate for Hacker of the Year, biggest Blow Hard and 8 more categories - make your voice heard!

Attention holiday shoppers! is LIVE!

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We’ve set up a sparkly new DEF CON store at to meet all of your various swag needs. We hope that it will be a smoother experience for everyone, with more options, more responsiveness and some room to grow. We’d love for you to check it out, and to check back for new items and replenished stock of your old favorites. Thank you as always for your support of DEF CON.


DEF CON Movie Night: Citizenfour!

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Hard as it may be to believe, the Snowden revelations are over 7 years old. The news cycle has accelerated so much in the intervening years that it seems like a relic from a different age, a slower timeline where a big story could make headlines for weeks instead of getting buried by four equally unsettling headlines before dinnertime.

Wherever you stand on the ethics of the disclosure, this glimpse at the scope of the US domestic surveillance apparatus has had enormous impact on the way the public views its privacy. In the last few weeks, Snowden's name has been in the news again as he accepts a permanent residency in Russia and his name is floated for a Presidential pardon. This seems like a good time to watch the documentary Citizenfour. Let's examine this artifact together and figure out if it hits different in 2020. I suspect strongly that it will.

Download .ical file: DC Movie NIght - Citizenfour.ics

DEF CON 29 CTF Qualifying Event: HXPCTF

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Good news from our friends at Order of the Overflow! Another DEF CON 29 CTF Pre-qualifying event has been announced!

The HXPCTF event on December 18, 2020 will be your next chance to get your team into the running for the Big Show - are you prepared?

follow @oooverflow on Twitter for updates, follow the links below to learn more and sign up.

The road to glory begins with a single step. Take that step.

DEF CON Movie Night: The Most Dangerous Game!

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The Most Dangerous Game' was made in 1932, but you can still hear its echoes in modern cinema. It's a surprisingly tense pre-code thriller about bored rich creeps who hunt humans for sport, and it walked so 'Predator' could run. Good fun, and a subtext that finds its way into movies a lot more often than you think. Watch this space for some more discussion of the film and join us in the DEF CON Discord Server Saturday Night at 8pm PST ( in movie-night-text and movie-night-voice.

DEF CON Movie Night: IT! The Terror from Beyond Space!

DEF CON Movie Night - IT! Poster image

This week, we are going to continue the simul-tubing experiment with 'IT! The Terror from Beyond Space" - a solid sci-fi thriller from 1958 that's one of the main inspirations for 'Alien'.

In case it isn't readable, that movie poster promises $50,000 to anyone who can prove the creature from the movie is NOT on Mars. You gotta respect a film that stands behind its premise.

Please join us November 28, 8PM PST in the DEF CON Discord ( in movie-night-text.

DEF CON Movie Night: WarGames!

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#defconmovienight update for November 21

Next week's movie will be the classic 80s hacker film 'War Games'.

"But how? Don't the terms and conditions at discord forbid sharing copyrighted content?"

Fair question.

If we showed the movie in discord, we could run into issues. However, 'War Games' is showing for free on YouTube, praised be the internets.

So the plan is to make it a double header. For the first hour, we'll show a talk from DEF CON 16 where The Dark Tangent interviews David Scott Lewis, engineer, consultant and the model for the David Lightman character in War Games. It's a fascinating interview that will give you a lot of insight into the main feature. If you want to watch it early, it's available at

Then, when the interview is over, we'll all synchronize watches and start up 'War Games' on YouTube. We'll still hang out and talk in movie-night-text like every week.

Hopefully, stuff like this expands the pool of available content to be Movie Nighted, and if it works we'll do it again from time to time.

Hope you'll join us at 8pm PST, November 21 in in movie-night-text and movie-night-voice, and help us kick things up a notch.

Happy Diwali

DEF CON Diwali 2020 image

DEF CON Movie Night: Reefer Madness!

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In honor of the five new states that legalized marijuana in this week's US elections, DEF CON Movie Night is showing the original 'Reefer Madness'. First released in1936, this anti-marijuana propaganda piece began as a church-funded film called 'Tell Your Children'. Designed to scare kids away from 'jazz cigarettes', the plot revolves wide-eyed teens lurching from innocence to utter depravity after a brief dalliance with what was likely some very weak-sauce Depression-era weed. Unintentional hilarity follows.

The filmmakers overplay their hand to such an extent that the film probably encouraged more stoners than it inhibited, and it became a cult favorite of pot enthusiasts and connoisseurs of badfilm in the 70s and inspired a remake in the 2000s.

We'll also be showing the (very) short film created in 1942 by the US government to encourage the growing of hemp. 'Hemp for Victory' was produced and for many years disavowed by the Department of Agriculture, and while it's not as riotously funny as 'Reefer Madness' it is not without charm. It's also pretty informative about the business side of a pretty remarkable family of plants.

Join us for some laughs and a pinch of agriculture propaganda at 8pm Pacific on Saturday Nov 7 in the DEF CON Discord ( in movie-night-text and movie-night-voice. Download iCal

DEF CON Election Security Resources!

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Waiting on election results? Pass the time by getting yourself up to speed on the many facets of election security! We've got a bunch of resources you can peruse. Take what you need, share where it's needed, follow @VotingVillageDC on Twitter and if you can, get involved in the fight for secure elections.

Get Involved! DEF CON Election Security Forum

DEF CON Voting Village Presentations:
DEF CON Safe Mode Voting Village Playlist
DEF CON 27 Voting Village Playlist
DEF CON 26 Voting Village Playlist
DEF CON 25 Voting Village Playlist

DEF CON Voting Village Official Reports:

DEF CON New Year's Eve: Save the Date!

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Save the Date:
DEF CON’s first New Year’s Eve Party
December 31, 2020 through January 1, 2021
(Download iCal)

Let’s ring in the New Year together! We’re putting together a free online party for the global DEF CON Community. Join us on our Discord server ( for some low-key DC-style amusements like Hacker Jeopardy, Drunk Hacker History, live music, movies - you know how we do. No talks, no lines, plenty of hacker fellowship and shenanigans.

We’ll provide the tunes, the games and contests, even some ‘celebrity’ bartenders. You just bring your dancing shoes and the refreshments of your choice.

DEF CON Halloween Movie Night: Night of the Living Dead!

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#Halloween2020 falls on a #defconmovienight - so we’re showing George Romero's groundbreaking (and public domain!) zombie thriller ‘Night of the Living Dead’!

If Halloween is on hold where you are, join us at 8pm PDT (GMT-7) 10/31 in in movie-night-text and movie-night-voice!

DEF CON Movie Night: Algiers!

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This week’s #defconmovienight selection is ‘Algiers’ nominated for 4 Oscars and American debut film of #hedylamarr - screen legend and patent holder for an early frequency-hopping ‘secret communication device’.

Join us Saturday at 8pm PDT (GMT-7) in in movie-night-text and movie-night-voice

DEF CON Movie Night: D.O.A.!

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DEF CON movie night returns 10/3 with another public domain jewel—1950 meta-noir ‘D.O.A’. Decades ahead of its time, DOA subverts the hardened gumshoe genre by forcing the protagonist to solve his own poisoning before he dies. It’s truly one of the greats—don't sleep on this one.

Join us at 8pm PDT (GMT-7) in in movie-night-text and movie-night-voice. BYO Good-n-Plenty.

Q&A Sessions from DEF CON Safe Mode!

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Friendly #defconsafemode reminder - we recorded the Q and A sessions for a bunch of the #defcon talks, so even if you've watched the talks on YouTube you might wanna check on this playlist of speaker/attendee interaction.

DEF CON 28 SAFE MODE Contest Results!

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Luminous humans of #DEFCON, #SafeMode is now in the books. The time to celebrate the many Contest Winners is at hand. We also celebrate everyone who competed - just the tiniest bit less, to keep everybody motivated. Congratulations to those who found glory. Encouragement and gratitude to those who didn’t this time. The real victory is the friends we made along the way, who were inside our hearts all along.

DEF CON 28 SAFE MODE Artwork Contest Winners!

DEF CON Safe Mode Rita Tu Artwork Contest image DEF CON Safe Mode Hannah Diaz Artwork Contest image

We want to offer our heartfelt thanks to everyone who entered the DEF CON Safe Mode Art Contest. We’re always amazed at the level of talent in this community.

This year’s runner up is a stylish meditation on the profusion of connectivities that characterize modern life by Rita Tu.

Much like Highlanders, however, in the end there can be only one. This year’s highlander is @hannahdiazart. The entry has both wide-eyed discovery (very on theme) and boxes full of random electronics (super relatable). Also a robot dinosaur. It communicates something about the hacker spirit that is both warm and life-affirming.

Congratulations to Hannah and Rita and thanks again to everyone who participated.

SAFE MODE Content is Live!

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To get the party started, we’re releasing a bunch of the content early. Over on the media server, we’ve got all of the main stage talks and materials, the soundtrack, demo labs, art, CTF, music - take what you like. Completists out there, we see you. There’s a very thicc torrent file as well. Take some time to watch the talks you’ve been waiting for at your leisure, so you’re ready for the live Q&A sessions starting Thursday. This will be the first DEF CON where you won’t have to pick between main stage talks and the rest of the show, so take advantage. If you had plans, we apologize.

So close now!

Upgrade to Human Plus, and Show your Support!

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DEF CON Safe Mode is almost here! We hope you’re as excited as we are. For everyone looking to support DEF CON in this unusually difficult time, we have a new option for you to consider - Human PLUS.

Safe Mode is free to all Humans, but you can upgrade to Human Plus for $20 USD on the DEF CON Discord for a few upgraded privileges. You get stuff like the ability to post pics and links, change your nick, access to Plus only chill out rooms and the good feeling that you’ve helped keep DEF CON alive until we meet again in Vegas. The information is all spelled out on

Your support makes DEF CON possible, and we appreciate all the encouragement and enthusiasm you’ve brought to this first-time online event. Thanks for sticking with us - we can’t wait until we get to do it again in person. DEF CON hearts you.

DEF CON Safe Mode Villages Are Live!

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More DEF CON Safe Mode News - The Villages Page is LIVE! Check out the 30 (!) villages that are taking part and start planning your Con. Links are provided to the appropriate DEF CON forum nodes for each village and the various info you’ll need to participate. We’re almost there, people. #getpsyched!

Demo Labs are Back for Safe Mode!

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The ever-popular DEF CON Demo Labs are returning for #defconsafemode! Support open-source hotness and the work of your fellow hackers and maybe even get some inspiration for your own projects. The full list of offerings is live on the DEF CON Demo Labs Page!

DEF CON Safe Mode Music Lineup!

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Here at the DEF CON Research Institute, we’ve been working hard to unlock the perfect blend of mind-expanding content and sweaty dancefloor abandon that makes the perfect Con experience. You’ll be happy to know that we’re applying that research to the #defconsafemode experiment.

Friday and Saturday night, we’ll be providing tasty beats from the likes of Miss Jackalope, Skittish and Bus and Ninjula. Head over to the Safe Mode Entertainment Page for the complete lineup.

DEF CON Safe Mode Badges are Here!

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The DEF CON Safe Mode badge is here! This year’s model is created by the inimitable LostboY, veteran DEF CON badge and Mystery Challenge creator. While the physical format may be unfamiliar to the youngest among you, seasoned players will recognize it as a ‘cassette tape’ - an analog recording format consisting of a ribbon of magnetic tape and a plastic housing to keep your dirty fingers away from said tape. More on the DEF CON Safe Mode Badge Page

DEF CON Safe Mode Link Roundup!

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DEF CON Safe Mode is almost here! If you’re just getting around to checking out the offerings, here’s a little roundup of the stuff you need to know.

Visit the Forums: The planning for the many events of DEF CON Safe Mode is all happening on the DEF CON Forums. Whether you want to register for an event, offer to help out with a village, or just get a start on planning your DC weekend, you can find the relevant thread in the DC28 planning forum.

#Badgelife is still in effect: The DEF CON community creates a lot of really amazing badges, many of which are available for sale and/or trade. You can catch up with the community badges on the DEF CON Forums #badgeleife thread. You can also follow the hashtag #badgelife on Twitter and Instagram.

Of course, DEF CON has a badge this year, too. We’ll be announcing it quite soon. It’s the creation of returning puzzle master LosT (@1o57), so you’ll want to set aside some time to unock its mysteries.

Swag: If you’re wondering how to get your hands on DEF CON Safe Mode swag this year, we’ve got you covered over on the DEF CON eBay store!

So dive in! Get yourself set up on Discord and Twitch, fire up the DEF CON stream on soma fm for some musical inspiration and get your mind right. DEF CON 28 will be upon us before you know it.

NEW Safe Mode Swag in the Shop!

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We’ve got some brand new #DEFCONSafeMode items available at the DEF CON eBay store - a very cool pin, new flag, and a new tee and hoody with our beloved Jack in #glitchmode. Tighten up your Zoom game with a fresh new look!

Check Out the Con Calendar!

DEF CON Conference Calendar

DEF CON Safe Mode Reminder:

We’re keeping a calendar over on the DEF CON Forums with all the deadlines for content. As a bunch of these deadlines are imminent, it’s worth throwing a bookmark down on it. While you’re there you can also get involved in all sorts of planning discussions - your help and feedback are a big part of making this happen. Don’t miss the opportunity to help shape DEF CON Safe Mode.

Black Lives Matter

DEF CON Black Lives Matter

To DEF CON, Black lives matter. Justice matters. Accountability matters.

Acts performed by those with a badge are performed by the consent of all of us - because the authority of the badge ultimately does not belong to its bearer. The authority of the badge is on loan from us, the people.

There are real inequities in the way the law is applied to Black people in America. These inequities, rooted in the very foundations of the country, are stubborn things. They persist, and we are all accountable for them. With that accountability comes an obligation to make things right, to see justice done wherever it’s been denied, and work for a better tomorrow.

We have donated $5,000 to The Bail Project and $5,000 to the NAACP Legal Defense Fund in hopes that our little company can show some solidarity with the movement and help build that better world we all want.

As far as I’m concerned, none of this is political, or even controversial. I’m not interested in debating anyone’s humanity, or anyone’s right to equal treatment under the law. Good faith discussions about the best way to do the right thing, however, are always welcome. Moments where real change is possible are rare. Let’s not waste this one.

- The Dark Tangent

Art courtesy of @spuxo on instagram

DEF CON China 2 is Canceled

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We postponed the DEF CON China 2 event, hoping we'd be able to pick another date in 2020. Sadly, even now in mid-June we have too many unresolved concerns to go forward. We're cancelling DEF CON China 2, but we're hopeful we can return to Beijing in 2021. You can read DT's blog post about it in the DEF CON forums.

New DEF CON is Canceled Swag Up on our eBay Store!

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Swag alert! The DEF CON store has a ton of new #DEFCONisCanceled goodies for your delectation. The much requested mask is here, along with hats, pins and stickers. Thanks to everyone for your support while we construct #defconsafemode - stay tuned for even more new swag items in the coming days! Stay safe, and stay in touch.

DEF CON SAFE MODE Village Activity is Growing!


DEF CON Safe Mode is growing fast - check out these links to some of the Villages that are signing up to take part! New CFPs are opening up by the day. But don't stop there - jump into the forums and join the discussion. Your feedback is a crucial part of creating a great Con, so join us as we build this thing out. Exciting, ain't it?

From IOT Village: >> << Make sure to follow IoT Village on Twitch to get updates about our talks that go live on May 28th and 29th along with the talks that will be hosted there later this year for our @defcon CFP!!!

From Crypto and Privacy Village (@CryptoVillage): We're back! Our Call for Participation is officially open! For details on the Crypto & Privacy Village: Glitched CFP - check out our site!

From ICS Village: Submit your CFP @defcon for the Village!

From the Voting Village: Reminder: @defcon Voting Machine Hacking Village @VotingVillageDC speaker track CFP is OPEN! Call for Papers deadline June 12, 2020, at 5:00 PM PT
More information :

DEF CON eBay Store is Back!

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The DEF CON eBay store is back online! Thanks for bearing with us while we got everything sorted out. DEF CON Safe Mode merchandise (and all other DC merch, for that matter) will be available only on the DEF CON eBay store.

Stay tuned for new #defconiscanceled items, stay safe, and stay in touch with us on the DEF CON FORUMS!

2020 DEF CON CTF Quals Results!

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Congratulations to A*O*E, the winners of the DEF CON Safe Mode CTF Qualifiers, and our heartfelt thanks to the amazing team at Order of the Overflow for hosting a great event.

This year's @defcon Quals are over, but you don't have to stop yet! The scoreboard has been made static and the challenges are still available! Everyone can see challenge info, interact with the challenges (they'll stay up for a few days) and check the flags they can retrieve!/

2020 DEF CON CTF Quals are about to go live!

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The moment has arrived - the DEF CON CTF Quals are happening TODAY! Winner gets a seat at the DEF CON Safe Mode CTF event and a shot at everlasting glory. We wish the best of luck to all the contestants. Stay up to date with all the CTF updates by following our brilliant hosts, Order of the Overflow.

Godspeed, one and all.

DEF CON 28 has entered Safe Mode.

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The ‘DEF CON is canceled’ meme has crossed over into real life, courtesy of COVID-19. In early March we had hopes that things would be stable by August. That is no longer realistic. Currently there’s no way to gather everyone together and keep them safe, so The Dark Tangent has decided to cancel the in-person event.

We will try an experiment this year - an online DEF CON. Please read The Dark Tangent’s more detailed thoughts on the situation and then head over to the Forums to get involved. There is a DEF CON Safe Mode FAQ that should help to answer common questions.

We wish there was better news, but we hackers are a resilient bunch. Stay healthy, stay safe, and stay in touch so we can all be together virtually this August 6-9 and again for DEF CON 29 in person.


DEF CON 28 Covid-19 image

We've got an update from @thedarktangent entitled COVID-19 vs DEF CON v2. Please check it out for our latest thinking on #DEFCON28.

The TL;DR is that we're moving up the timetable - we'll have our announcement no later than May 15.

DEF CON 28 Press Registration is Open!

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Press Registration for DEF CON 28 is OPEN. We’ve posted the relevant information on the press registration page, so head over and get familiar if you want to reserve a spot. If you’ve got a question that’s not answered there, hit us up at and we’ll get you sorted out. As ever, we have a limited number of press badges, so it’s a good idea not to wait too long. We look forward to hearing from you!

View Kill Chain Documentary for free!

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From today until Memorial Day, you can view the full HBO documentary Kill Chain for free on HBO's YouTube Channel! The topic of this doc is election security and features our very own DEF CON Voting Village! Check it out!

Submit art for DEF CON 28!

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Reminder: DEF CON's art contest is back! Deadline June 15.

Also, we want to partner with a few artists from the DEF CON community for some themed art for DC28. If #discovery and DEF CON inspire you, get at us at

DEF CON Book Club!

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Books. We love ‘em. And right now, we have a major reading opportunity happening for all of us, at the same time. What better way to make use of this moment than to read something together?

Enter the #defconbookclub! Starting In April, we’re inviting you to join us - we’ll all read a book together and discuss it in its own Forum thread. Nikita has set up all the relevant info here:

The first task is picking the book, and we’re asking for nominations. Let’s keep it Non-technical, thematically connected to ‘Discovery’ and reasonably easy to locate. Suggestions can go in the info thread.

We’re excited about this. Let’s make the most of this downtime together.

DEF CON 28 Call for Training

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Calling all teachers of the hacking arts! We’re looking to turn the Monday after DEF CON 28 into a full day of trainings! We’re calling for all-day (8 hours with breaks) sessions on meaty technical topics.

If this sounds like your jam, check out the requirements and compensation info at

If you want to keep an eye on this new project as it develops, check in with the trainings thread on the DEF CON Forums. This is new territory for us - help us make it happen!

DEF CON 28 Update

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Like everyone, we’re watching the Covid-19 situation intently. @thedarktangent lays out his thoughts RE: DEF CON 28 in a Forum post here:

The #tldr is we’re going forward w/Con prep for now. We’ll update if that changes & revisit the issue June 1.

ATTN: Art Makers of the DEF CON Community!

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We’re bringing back the Art Contest for DEF CON with a few fun twists. If you want in, sharpen up your crayons - the deadline is June 15, 2020, and it will be upon us faster than you think.

Submissions should be mailed to

Info and rules are on the Artwork Contest Page.

We can't wait to see what you create!

DEF CON 28 Call for Papers!

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The DEF CON 28 CFP is LIVE! The time has come to whip that idea into submission-ready shape - you have until May 1 and we can offer a lot more help if you don’t wait til the last minute. Let's light this candle!

DEF CON 28 Call for Everything!

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The time has come, everyone! The DEF CON 28 Call for EVERYTHING is LIVE! We're throwing open the door on a ton of different opportunities to participate in the CON.

If you're looking to get involved, this is your moment to shine. We're looking for new contests and events, Workshops, Villages, Parties, Demo Labs and even Musical Performers. Every DEF CON, hundreds of amazing hackers contact us with ideas to take DC to the next level. You can be one of those amazing humans - just look through the cornucopia of options on the CFE page, read the rules, and get in where you fit in!

There's no better way to get involved than rolling up your sleeves and making something to share. If your idea looks like a good fit, we'll get you the resources to realize your vision.

Discover what you have to share. Discover what it feels like when you share it. Let's make this DEF CON unforgettable.

DEF CON 28 Call for Music and Call for Soundtrack are Open!

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Call for Music:
The DEF CON 28 preparations are in full swing, and it’s time to put out the call for music! We have a lot of spaces to fill with groovy sounds, and we want your help. DJs, shredders, yodelers - if you have what it takes to move the DEF CON crowd, read the rules, fill out the application and show us what you’ve got.

Call for Soundtrack Entries:
DEF CON has a soundtrack. Not just the one playing in your head as you navigate the venue in search of more things to hack, either. DEF CON has a real-deal soundtrack full of hot tracks donated by super-cool artists like Information Society, BT, MC Frontalot - and maybe YOU.

You know you want to have a track of yours handed out to the DEF CON 28 attendees. Fill out the form and apply - immortality awaits.

Important Announcement regarding DEF CON China 2.0

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In light of global precautions being announced to combat the coronavirus outbreak, we’ve decided to postpone DEF CON China 2.0. We regret inconveniencing any of you. Know that we are committed to holding the event once it’s safe to do so.

If you want a refund on purchased tickets, please submit a refund request to your ticket broker. If you'd rather that we hold your reservation for our new dates, you don't have to do anything and we'll keep your tickets on file.

The situation is still developing. We’re working to find alternative dates for DEF CON China 2.0. Keep in touch with us on social media and We’ll share our plans as soon as we’re able.

Our hearts go out to our many friends in the affected regions. We encourage everyone to stay safe, and we look forward to reuniting when this is behind us.

Happy Lunar New Year!

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DEF CON China 2.0 Call for Villages!

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Villages are a signature part of the DEF CON experience. All-day, hands-on hacker spaces where you can learn something new, level up your skills and interact with friendly experts and fellow enthusiasts. We're always looking for new village ideas - if you've got one for #defconchina2, we want to hear from you! The best way to get involved in the DEF CON experience is to roll up your sleeves and start sharing what you know. Read about the Village requirements here:

DEF CON 2020 Theme: Discovery!

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The concept is simple, but for us it drives everything.

Learning how something works, how it doesn't, or how you can make it do something amazing and off-label for the very first time.

Meeting people who know what you're talking about, or people who know that one thing you're trying to learn.

The skill you never expected to develop, the contest a near-stranger talked you into, the group of friends you didn't know you'd meet.

All the best and most exciting parts of DEF CON are the moments of discovery. So that's our theme.

To translate that feeling into the physical space of DEF CON 2020, we offer these bits of inspiration.

The color palette is derived from internet publications of the early 1990s. It was the breakthrough moment of The Web. As people raced to define the new frontier, magazines like Mondo2000 and Wired tried to convey the excitement with loud colors and edgy layouts.

The style we took from 90s 'zine culture - an amazing, boundlessly creative and wildly unprofessional DIY movement that, just like the internet, invited everyone to stop consuming culture and start creating and sharing it. Ideas over production value, attitude over polish, getting your ideas out over getting them perfect.

We hope you'll take that anarchic DIY spirit with you when you're working on whatever you're bringing to DEF CON. We can't wait to discover what you create.

DEF CON China 2.0 Tickets On Sale Now!

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DEF CON China 2.0 tickets are on sale now! We're returning to 751 D Park in Beijing April 17-19. We will be bringing our famous mix of world-class speakers, hands on learning and exciting contests and entertainment. We'd love to see you there!

Tickets are priced as follows:

Student Rate (with valid undergraduate or lower student ID) $US82 / ¥488
Early Bird Rate (purchased by 29 February) $US115 / ¥688
Regular Rate (1 March Through April 15) $US180 / ¥1088

There are several ways to get your tickets:

Cash at the door - DEF CON accepts local currency at the venue - the price is ¥1088 (regular rate).

For everyone who wants to purchase tickets prior to the event, we can offer several payment options through 4Hou's billing portal.

Pay Pal - guests with a PayPal account can use it to make a payment in US dollars:

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Buy with Paypal (en)

WePay and Ali Pay - guests with WePay and AliPay can use those accounts to pay through the Chinese-language section of the 4hou portal:

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Buy with Ali Pay/ WePay (cn)

Invoices - business entities wishing to pay via invoice or seeking a bulk ticket discount can contact 4hou directly by calling the Helpline at +8610-64780062 or email

Reminder: DEF CON China CFP is Open!

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Another reminder: DEF CON China 2.0 has an open CFP! We’re looking for presenters with exciting ideas to share in Beijing April 17-19 2020. If that’s you, get cracking! The sooner we hear from you the better your chances. Check out the submission information on the DEF CON website and get at us. Act now - CFP Reviewers are standing by!

Happy New Year!

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Merry Christmas!

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DEF CON China 2.0 Call for Papers!

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More DEF CON China 2 news - the Call For Papers is officially open! If you’ve got something amazing to present in Beijing this April, we’re ready to hear from you.  You’ve got until  February 3, 2020 to get your proposal in to us, but sooner is better.

If you’ve got a presentation that’s worthy but needs some attention to make it across the finish line, our amazing CFP Review Board can help. Time permitting, of course.  Drop it on us five minutes before the deadline and this kind of personal attention becomes ... unlikely, so don’t let procrastination hijack your opportunity.

For speakers coming from outside of China, we provide hotel accommodations and we can offer up to $US900 toward airfare.  You can learn all the details your heart desires at the DEF CON China 2.0 CFP Page. We look forward to seeing what you’re working on.

Happy Thanksgiving!

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DEF CON 27 Wireless Village talks are on Youtube!

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The presentations from DEF CON 27's many Villages are coming online! First out of the chute is Wireless Village. We've got 15 talks, ranging from a deep dive into WiFi 6 to reverse engineering a wireless model railroad. If wireless is your jam, get into a cozy spot and treat yourself. As always, share with those you think could benefit. More villages on the way.

DEF CON China returns!

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Some more good news for your weekend - DEF CON CHINA 2 has official dates! We'll be back in Beijing's 751 D Park Art District April 16-19, 2020! We'll be bringing new talks and more hands-on Village experiences, and we hope we'll see you there. This will be our third event in China, and we've got big plans to make it the best yet.

If you're interested in participating at DC China 2, make sure to keep an eye on our website and social media. We'll be announcing the Calls for Content soon and we can't wait to see what you've got to share.

Join us, and spread the word.

Video from DEF CON 27 Main Tracks is Now on YouTube!

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As part of our ongoing Hackucation As A Service (HaaS) initiative, we're rolling out hundreds of hours of compelling content from DEF CON 27 on our YouTube channel. Today's installment - all the presentations from the DEF CON 27 main tracks. The Village videos will follow over the next week or so. Enjoy responsibly* and please pass on the info to all those you think might benefit. Sharing is caring.

Many thanks to all of the presenters who shared their knowledge with us at DEF CON 27, and all of the attendees who power DEF CON's efforts to hackucate the world. We can't wait to join you again at DEF CON 28.

*Binging best practices include choosing a comfortable spot with access to power and bandwidth, frequent stretching and crucially, hydration. Headphones are optional but recommended in cases where you might be observed by fellow commuters or supervisors.

SECTF Report from DEF CON 27!

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From The news release on

It is that time of year again—we finally recovered from DEF CON (yes it takes months), and we analyzed all the data, crunched all the numbers, and produced yet another report for your reading enjoyment. Read on...

Happy Halloween!

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DEF CON 28 CTF Quals!

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Attention hackers! Aside from the prequal events, you will all have a chance to qualify for DEF CON 28 CTF through the DEF CON CTF Qualifying event!

#DC28Quals will be held March 27! Start practicing now!

Stay up to date with all the CTF updates by following our brilliant hosts, Order of the Overflow.

DEF CON 27 Voting Village Report!

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The DEF CON Voting Village has released its findings from DEF CON 27!

This is the third year we've hosted the Voting Village, and this year we were able to give attendees access to over 100 machines, all of which are currently certified for use in at least one US jurisdiction. The units tested included direct-recording electronic (DRE) voting machines, electronic poll books, Ballot Marking Devices (BMDs), Optical scanners and Hybrid systems.

The hackers at DEF CON once again compromised every single machine over the 2.5 day event, many of them with trivial attacks that require no sophistication or special knowledge on the part of the attacker. In too many cases physical ports remain unprotected, passwords remain unset or left in default configurations and security features of the underlying commercial hardware are left unused or even disabled.

In addition to showing the security weaknesses found in the wide variety of election tech on display, the Voting Village team's report shares its strong recommendations for improving election security, most notably the urgent need for paper ballots and rigorous post-election audits.

For any of those recommendations to become real, voters need to get informed and get the attention of their elected representatives about these issues.

You can also share your thoughts and get involved in the ongoing Voting Village conversation on the DEF CON Forums. We're very interested in what you have to contribute.

DEF CON 27 Voting Village Report is Out Tomorrow!

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The DEF CON 27 Voting Village Report is going to be released tomorrow! Congresspeople Rep. Jackie Speier and Senator Ron Wyden will be on hand for the discussion of all the new things we learned about election security this summer.

The event will be held in Washington DC at the US Capitol Visitor Center - Congressional Auditorium and Atrium at 2pm on September 26.

Of course, we'll be sharing the report when it's available as well, so stay tuned.

DEF CON in the news, Aviation Village Edition

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From the article " Aviation security is taking off—and taking after car security" on the Parallax:

“The hackers, security researchers, government organizations, and private airlines involved in the aviation-hacking exhibition of the world’s largest hacking confab, held here in August, all say the chances of your next commercial flight getting hacked are extremely small. But the scenario is also the inspiration for DEF CON’s “Aviation Village”: They want to keep it that way.”

Early Release Video: CDC Panel!

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Some more early release video from DEF CON 27 to brighten your day - please enjoy the Cult of the Dead Cow panel. If you are familiar with cDc, you know why this is so cool. If you are unfamiliar, it's time to get familiar.

Soak in some True School vibes, learn some lore and pass it on.

Book a Room for DEF CON 28!

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DEF CON 27 is in the books, but it’s never too early to start planning for DEF CON 28! Well, maybe last week would have been too early. This week, however, is perfect.

The hotel registration link for DEF CON 28 at the Caesars Forum August 6-9, 2020 is open for business. If you want to make sure you get in on that sweet, sweet DEF CON room block action, we’re ready for you.