DEF CON

DEF CON (also written as DEFCON, Defcon or DC) is a hacker convention held annually in Las Vegas, Nevada. The first DEF CON took place in June 1993 and today many attendees at DEF CON include computer security professionals, journalists, lawyers, federal government employees, security researchers, students, and hackers with a general interest in software, computer architecture, hardware modification, conference badges, and anything else that can be "hacked". The event consists of several tracks of speakers about computer- and hacking-related subjects, as well as cyber-security challenges and competitions (known as hacking wargames). Contests held during the event are extremely varied and can range from creating the longest Wi-Fi connection to finding the most effective way to cool a beer in the Nevada heat.[2]

This article is about the computer security convention. For other uses, see Defcon (disambiguation).
DEF CON
StatusActive
GenreSecurity Conference, Hacker Conference
FrequencyAnnual
Venuevaries
Location(s)Las Vegas, Nevada
Years active30
InauguratedJune 9, 1993 (1993-06-09)[1]
FounderJeff Moss
Previous eventAugust 10–13, 2023
Next eventAugust 8–11, 2024
AttendanceOver 30,000
Websitedefcon.org
Part of a series on
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Other contests, past and present, include lockpicking, robotics-related contests, art, slogan, coffee wars, scavenger hunt, and Capture the Flag. Capture the Flag (CTF) is perhaps the best known of these contests and is a hacking competition where teams of hackers attempt to attack and defend computers and networks using software and network structures. CTF has been emulated at other hacking conferences as well as in academic and military contexts (as red team exercises).

Federal law enforcement agents from the FBI, DoD, United States Postal Inspection Service, DHS (via CISA) and other agencies regularly attend DEF CON.[3][4]

History

DEF CON was founded in 1993, by then 18-year-old Jeff Moss as a farewell party for his friend, a fellow hacker and member of "Platinum Net", a FidoNet protocol based hacking network from Canada.[5] The party was planned for Las Vegas a few days before his friend was to leave the United States, because his father had accepted employment out of the country. However, his friend's father left early, taking his friend along, so Jeff was left alone with the entire party planned. Jeff decided to invite all his hacker friends to go to Las Vegas with him and have the party with them instead. Hacker friends from far and wide got together and laid the foundation for DEF CON, with roughly 100 people in attendance.

The term DEF CON comes from the movie WarGames, referencing the U.S. Armed Forces defense readiness condition (DEFCON). In the movie, Las Vegas was selected as a nuclear target, and since the event was being hosted in Las Vegas, it occurred to Jeff Moss to name the convention DEF CON. However, to a lesser extent, CON also stands for convention and DEF is taken from the letters on the number 3 on a telephone keypad, a reference to phreakers.[6] Any variation of the spelling, other than "DEF CON", could be considered an infringement of the DEF CON brand. The official name of the conference includes a space in-between DEF and CON.

Though intended to be a one-time event, Moss received overwhelmingly positive feedback from attendees, and decided to host the event for a second year at their urging. The event's attendance nearly doubled the second year, and has enjoyed continued success.[7] In 2019, an estimated 30,000 people attended DEF CON 27.[8]

For DEF CON's 20th Anniversary, a film was commissioned entitled DEFCON: The Documentary.[9] The film follows the four days of the conference, events and people (attendees and staff), and covers history and philosophy behind DEF CON's success and unique experiences.

In January 2018, the DEF CON China Beta event was announced. The conference was held May 11–13, 2018 in Beijing, and marked DEF CON's first conference outside the United States. The second annual DEF CON China was canceled due to concerns related to COVID-19.[10]

In 2020, due to safety concerns over COVID-19 the DEF CON 28 in-person Las Vegas event was cancelled[11] and replaced with DEF CON Safe Mode,[12] a virtual event planned for the same August 6–9 dates as DC 28.

In 2021, DEF CON 29 was held on August 5-8 in-person in Las Vegas and virtually (via Twitch and Discord). In-person attendees were required wear masks in conference areas and to show proof to COVID-19 vaccination. Attendees with verified vaccine records (verified by a 3rd party) were given a wristband which was required for entry into the conference areas. [13]

Black Badge

The Black Badge is the highest award DEF CON gives to contest winners of certain events. Capture the flag (CTF) winners sometimes earn these, as well as Hacker Jeopardy winners. The contests that are awarded Black Badges vary from year to year, and a Black Badge allows free entrance to DEF CON for life, potentially a value of thousands of dollars.[14]

In April 2017, a DEF CON Black Badge was featured in an exhibit[15] in the Smithsonian Institution's National Museum of American History entitled "Innovations in Defense: Artificial Intelligence and the Challenge of Cybersecurity". The badge belongs to ForAllSecure's Mayhem Cyber Reasoning System,[16] the winner of the DARPA 2016 Cyber Grand Challenge at DEF CON 24 and the first non-human entity ever to earn a Black Badge.

Fundraising

Since DEF CON 11, fundraisers have been conducted for the Electronic Frontier Foundation (EFF). The first fundraiser was a dunk tank and was an "official" event. The EFF now has an event named "The Summit" hosted by the Vegas 2.0 crew that is an open event and fundraiser. DEF CON 18 (2010) hosted a new fundraiser called MohawkCon.

Trivia

Badges

A notable part of DEF CON is the conference badge, which identifies attendees and ensures attendees can access conference events and activities. The DEF CON badge has historically been notable because of its changing nature, sometimes being an electronic badge (PCB), with LEDs, or sometimes being a non-electronic badge such as a vinyl record. Conference badges often contain challenges or callbacks to hacker or other technology history, such as the usage of the Konami Code in the DEF CON 24 badge, or the DEF CON 25 badge reverting to the look of the DEF CON 1 badge. DEF CON Badges do not (generally) identify attendees by name; however, the badges are used to differentiate attendees from others. One way of doing this has been to have different badges, a general conference attendee (HUMAN) badge, a Staff member (GOON), Vendor, Speaker, Press, and other badges. In addition, individuals and organizations have begun creating their own badges in what has become known as badgelife. These badges may be purchased in many cases, or earned at the conference by completing challenges or events. Some badges may give the holder access to after hours events at the conference. In 2018, the evolution of this came with what was termed "shitty addon's" or SAOs. These were miniature (usually) PCBs that connected to the official and other badges that may extend functionality or were just collected.[17][18]

Multiple, electronic and non-electronic, DEF CON human badges and other con badges.

Workshops

Workshops are dedicated classes on various topics related to information security and related topics. Historical workshops have been held on topics such as Digital Forensics investigation, hacking IoT devices, playing with RFID, fuzzing and attacking smart devices.

Villages

Villages are dedicated spaces arranged around a specific topic. Villages may be considered mini conferences within the con, with many holding their own independent talks as well as hands-on activities such as CTFs, or labs. Some villages include Aerospace Village, Car Hacking Village, IoT Village, Recon, Biohacking, lockpicking, ham radio, and the well known Social Engineering and vote hacking villages. In 2018 the vote hacking village gained media attention due to concerns about US election systems security vulnerabilities.[19] [20]

Use of handles

Attendees at DEF CON and other Hacker conferences often utilize an alias or "handle" at conferences. This is in keeping with the hacker community's desire for anonymity. Some known handles include DEF CON founder Jeff Moss' handle of "Dark Tangent". A notable event at DEF CON is DEF CON 101 which starts off the con and may offer the opportunity for an individual to come up on stage and be assigned a handle by a number of members of the community.

Cons within DEF CON

DEF CON has its own cultural underground which results in individuals wanting to create their own meetups or "cons" within DEF CON. These may be actual formal meetups or may be informal. Well known cons are:

  • Queercon, a meetup of LGBTQ community
  • Linecon, any long line has the potential to turn into a con
  • QuietCon, a meetup to hang out or talk quietly away from the hustle and bustle of the rest of the con

DEF CON Groups

DEF CON Groups are worldwide, local chapters of hackers, thinkers, makers and others. DEF CON Groups were started as a splinter off of the 2600 meetup groups because of concerns over politicization. Local DEF CON groups are formed and are posted online.[21] DEF CON Groups are usually identified by the area code of the area where they are located in the US, and by other numbers when outside of the US e.g., DC801, DC201. DEF CON Groups may seek permission to make a logo that includes the official DEF CON logo with approval.

Relationship to other hacker cons

DEF CON is considered the "world's largest" hacker con. It is also considered one of the core conferences, with organizers and attendees using it as a model for other conferences.

Notable incidents

High-profile issues which have garnered significant media attention.

Year Description
1999 On July 10, 1999, the Cult of the Dead Cow hacker collective released Back Orifice 2000 (later discovered to be infected with the CIH virus) at DEF CON 7, in what was, at the time, the largest presentation in DEF CON history.
2001 On July 16, 2001, Russian programmer Dmitry Sklyarov was arrested the day after DEF CON for writing software to decrypt Adobe's e-book format.
2005 On July 31, 2005, Cisco used legal threats to suppress Mike Lynn from presenting at DEF CON about flaws he had found in the Cisco IOS used on routers.[22]
2007 In August 2007, Michelle Madigan, a reporter for Dateline NBC, attempted to secretly record hackers admitting to crimes at the convention. After being outed by DEF CON founder Jeff Moss during an assembly, she was heckled and chased out of the convention by attendees for her use of covert audio and video recording equipment. DEF CON staff tried to get Madigan to obtain a press pass before the outing happened.[23] A DEF CON source at NBC had tipped off organizers to Madigan's plans.[3]
2008
Main article: Massachusetts Bay Transportation Authority v. Anderson
MIT students Zack Anderson, R.J. Ryan and Alessandro Chiesa were to present a session entitled "The Anatomy of a Subway Hack: Breaking Crypto RFIDS and Magstripes of Ticketing Systems." The presentation description included the phrase "Want free subway rides for life?" and promised to focus on the Boston T subway.[24] However, the Massachusetts Bay Transit Authority (MBTA) sued the students and MIT in United States District Court in Massachusetts on August 8 2008, claiming that the students violated the Computer Fraud and Abuse Act (CFAA) by delivering information to conference attendees that could be used to defraud the MBTA of transit fares.[25][26] The court issued a temporary restraining order prohibiting the students from disclosing the material for a period of ten days, despite the fact the material had already been disseminated to DEF CON attendees at the start of the show.

In 2008's contest "Race to Zero," contestants submitted a version of given malware which was required to be undetectable by all of the antivirus engines in each round. The contest concept attracted much negative attention.[27][28]

2009 WIRED[29] reported that an ATM kiosk was positioned in the conference center of the Riviera Hotel Casino capturing data from an unknown number of hackers attending the DEF CON hacker conference.
2011 Security company HBGary Federal used legal threats to prevent former CEO Aaron Barr from attending a panel discussion at the conference.[30]
2012 The director of the National Security Agency, Keith B. Alexander, gave the keynote speech.[31] During the question and answers session, the first question for Alexander,[31] fielded by Jeff Moss,[32] was "Does the NSA really keep a file on everyone, and if so, how can I see mine?" Alexander replied "Our job is foreign intelligence" and that "Those who would want to weave the story that we have millions or hundreds of millions of dossiers on people, is absolutely false…From my perspective, this is absolute nonsense."[31]

On March 12, 2013, during a United States Senate Select Committee on Intelligence hearing, Senator Ron Wyden quoted the 2012 DEF CON keynote speech and asked Director of National Intelligence James Clapper if the U.S. conducted domestic surveillance; Clapper made statements saying that there was no intentional domestic surveillance.[31] In June 2013, NSA surveillance programs which collected data on US citizens, such as PRISM, had been exposed. Andy Greenberg of Forbes said that NSA officials, including Alexander, in the years 2012 and 2013 "publicly denied–often with carefully hedged words–participating in the kind of snooping on Americans that has since become nearly undeniable."[31]

2013 On July 11, 2013, Jeff Moss posted a statement,[33] located on the DEF CON blog, titled "Feds, We Need Some Time Apart". It stated that "I think it would be best for everyone involved if the feds call a 'time-out' and not attend DEF CON this year."[34] This was the first time in the organization's history that it had asked federal authorities not to attend.[33] Actor Will Smith visited the convention to study the DEF CON culture for an upcoming movie role.
2016 On August 4, 2016, DEF CON and DARPA co-hosted the 2016 Cyber Grand Challenge, a first-of-its-kind all-machine hacking tournament. Competing teams had to create a bot capable of handling all aspects of offense and defense with complete autonomy. Seven finalists competed for a US$2M grand prize.

The winner of the Cyber Grand Challenge was "Mayhem", an AI created by ForAllSecure of Pittsburgh, Pennsylvania.[35] Mayhem then went on to participate in the previously humans-only DEF CON Capture the Flag Contest,[36] where it finished in last place, despite pulling ahead of human teams often in a contest for which it was not specifically designed.

2017 At the "Voting Machine Village" event, dozens of voting machines brought to the conference were breached.[37]

In September 2017, the Voting Machine Village produced "DEF CON 25 Voting Machine Hacking Village: Report on Cyber Vulnerabilities in US Election Equipment, Databases and Infrastructure" summarizing its findings. The findings were publicly released at an event sponsored by the Atlantic Council[38] and the paper went on to win an O'Reilly Defender Research Award.[39]

Marcus Hutchins, better known online by his handle MalwareTech, the 23-year-old British security researcher who was credited with stopping the WannaCry outbreak was arrested by the FBI at the airport preparing to leave the country after attending DEF CON over his alleged involvement with the Kronos banking trojan.[40]

2018 In March 2018, the DEF CON Voting Machine Hacking Village was awarded a Cybersecurity Excellence Award.[41] The award cites both the spurring of a national dialog around securing the US election system and the release of the nation's first cybersecurity election plan.
2020 On May 8, 2020, the DEF CON in-person conference itself was cancelled[42] and virtualized due to COVID-19. DEF CON Safe Mode[43] was held August 6–9 online with a full roster of talks, villages, contests and events.

Entertainment references
  • DEF CON was also portrayed in The X-Files episode "Three of a Kind" featuring an appearance by The Lone Gunmen. DEF CON was portrayed as a United States government–sponsored convention instead of a civilian convention.
  • A semi-fictionalized account of DEF CON 2, "Cyber Christ Meets Lady Luck", written by Winn Schwartau, demonstrates some of the early DEF CON culture.[44]
  • A trip to DEF CON for a hacker showdown figures into the plot of The Signal. Director William Eubank came to Las Vegas and screened the film at DEF CON Movie Night.
  • A fictionalized version of DEF CON called "EXOCON" is the setting for the climax of Jason Bourne, the fifth film of the Bourne film series. The primary antagonist of the film, a fictionalized CIA director (played by Tommy Lee Jones), is a keynote speaker at the event, mimicking DEF CON 20's controversial keynote speaker, NSA director Keith B. Alexander.
  • In the Mr. Robot Season 3 opener "eps3.0_power-saver-mode.h" Elliot and Darlene visit a qualifying tournament for the DEF CON Capture the Flag (CTF) contest. Sharp-eyed viewers will notice DEF CON's smiley-face-and-crossbones mascot Jack among the set decorations.
  • Documentarian Werner Herzog included DEF CON in his 2016 film Lo and Behold, Reveries of the Connected World, a film described as a "playful yet chilling examination of our rapidly interconnecting online lives".

Venues, dates, and attendance

Each conference venue and date has been extracted from the DEF CON archives for easy reference.[45]

DC Hotel Days Year Attendance
DEF CON 33 TBD August 7-10 2025 N/A
DEF CON 32 Caesars Forum, Flamingo, Harrah's Hotel, and Linq Hotel August 8-11 2024 N/A
DEF CON 31 Caesars Forum, Flamingo, Harrah's Hotel, and Linq Hotel August 10-13 2023 ~25,000
DEF CON 30 Caesars Forum, Flamingo, Harrah's Hotel, and Linq Hotel August 11–14 2022 ~25,000
DEF CON 29 Paris Hotel and Bally's Hotel August 5–8 2021 ~8,700
DEF CON Safe Mode Virtual event August 6–9 2020 N/A
DEF CON 28 Planned Caesars Forum, Harrah's, The Linq, and Flamingo August 6–9 2020 0[46]
DEF CON 27 Paris Hotel, Bally's Hotel, Planet Hollywood, and Flamingo August 8–11 2019 ~30,000[8]
DEF CON China 1.0 751 D-Park May 31 – June 2 2019 Unknown
DEF CON 26 Caesars Palace and Flamingo August 9–12 2018 28,000[47]
DEF CON China [Beta] Kuntai Hotel (Beijing) May 11–13 2018 Unknown
DEF CON 25 Caesars Palace July 27–30 2017 25,000[48]
DEF CON 24 Paris Hotel and Bally's Hotel August 4–7 2016 22,000[49]
DEF CON 23 Paris Hotel and Bally's Hotel August 6–9 2015 16,000+[50]
DEF CON 22 Rio Hotel & Casino August 7–10 2014 16,000[51]
DEF CON 21 Rio Hotel & Casino August 1–4 2013 12,000[51]
DEF CON 20 Rio Hotel & Casino July 26–29 2012 Unknown
DEF CON 19 Rio Hotel & Casino August 4–7 2011 Unknown
DEF CON 18 Riviera Hotel & Casino July 30 – August 1 2010 Unknown
DEF CON 17 Riviera Hotel & Casino July 30 – August 2 2009 Unknown
DEF CON 16 Riviera Hotel & Casino August 8–10 2008 8,000[52]
DEF CON 15 Riviera Hotel & Casino August 3–5 2007 Unknown
DEF CON 14 Riviera Hotel & Casino August 4–6 2006 Unknown
DEF CON 13 Alexis Park Resort July 29–31 2005 Unknown
DEF CON 12 Alexis Park Resort July 30 – August 1 2004 Unknown
DEF CON 11 Alexis Park Resort August 1–3 2003 Unknown
DEF CON 10 Alexis Park Resort August 2–4 2002 Unknown
DEF CON 9 Alexis Park Resort July 13–15 2001 Unknown
DEF CON 8 Alexis Park Resort July 28–30 2000 Unknown
DEF CON 7 Alexis Park Resort July 9–11 1999 Unknown
DEF CON 6 Plaza Hotel & Casino July 31 – August 2 1998 Unknown
DEF CON 5 Aladdin Hotel & Casino July 11–13 1997 Unknown
DEF CON 4 Monte Carlo Resort and Casino July 26–28 1996 Unknown
DEF CON 3 Tropicana Resort & Casino August 4–6 1995 Unknown
DEF CON 2 Sahara Hotel and Casino July 22–24 1994 ~200
DEF CON 1 Sands Hotel and Casino June 9–11 1993 ~100

See also

References
  1. "Def Con 1 Archive". Retrieved 2017-04-23.
  2. "DefCon Beverage Cooling Contraption Contest". deviating.net.
  3. Zetter, Kim (3 August 2007). "Dateline Mole Allegedly at DefCon with Hidden Camera – Updated: Mole Caught on Tape". Wired Blog Network. Retrieved 2007-08-15. According to DefCon staff, Madigan had told someone she wanted to out an undercover federal agent at DefCon. That person in turn warned DefCon about Madigan's plans. Federal law enforcement agents from FBI, DoD, United States Postal Inspection Service and other agencies regularly attend DefCon to gather intelligence on the latest techniques of hackers.
  4. "DEFCON 15 FAQ's". Retrieved 9 Feb 2011. Lots of people come to DEFCON and are doing their job; security professionals, federal agents, and the press.
  5. Tangent, The Dark. "DEF CON® Hacking Conference – About". www.defcon.org. Retrieved 2016-03-12.
  6. "DEFCON about".
  7. Jeff Moss (July 30, 2007). The Story of DEFCON. Retrieved 9 Feb 2011.
  8. "Def Con 27 Transparency Report - DEF CON Forums". forum.defcon.org. Retrieved 2019-08-17.
  9. DEFCON: The Documentary at IMDb
  10. "Coronavirus claims new victim: 'DEF CON cancelled' joke cancelled after DEF CON China actually cancelled". The Register.
  11. Newman, Lily Hay. "Defcon is Cancelled". Wired.
  12. "DEF CON 28 Safe Mode FAQ".
  13. "DEF CON 29 FAQ".
  14. Tangent, The Dark. "DEF CON® Hacking Conference – Black Badge Hall of Fame". www.defcon.org. Retrieved 2016-03-12.
  15. "Innovations in Defense: Artificial Intelligence and the Challenge of Cybersecurity". americanhistory.si.edu. 20 April 2017.
  16. "Mayhem Wins DARPA CGC". Archived from the original on 2019-02-15. Retrieved 2017-04-24.
  17. Oberhaus, Daniel (September 18, 2018). "A History of Badgelife, Def Con's Unlikely Obsession with Artistic Circuit Boards". Vice Motherboard. Vice Motherboard. Retrieved January 14, 2019.
  18. McAllister, Neil (August 12, 2015). "Is this the most puzzling DEF CON attendee badge yet on record?". The Register UK. The Register UK. Retrieved January 14, 2019.
  19. Molina, Brett (August 14, 2018). "11-year-old hacks replica of Florida state website, changes election results". usatoday.com. USA TODAY. Retrieved January 14, 2019.
  20. "Home". Aerospace Village.
  21. "Official forums social group section for DEF CON groups". DEF CON Forums. Retrieved 2023-02-25.
  22. Lamos, Rob (31 July 2005). "Exploit writers team up to target Cisco routers". SecurityFocus. Retrieved 2004-07-31.
  23. Cassel, David (4 August 2007). "Transcript: Michelle Madigan's run from Defcon". Tech.Blorge.com. Archived from the original on 2007-09-08. Retrieved 2007-08-15.
  24. Lundin, Leigh (2008-08-17). "Dangerous Ideas". MBTA v DefCon 16. Criminal Brief. Retrieved 2010-10-07.
  25. Jeschke, Rebecca (2008-08-09). "MIT Students Gagged by Federal Court Judge". Press Room. EFF.
  26. Massachusetts Bay Transit Authority v. Zack Anderson, RJ Ryan, Alessandro Chiesa, and the Massachusetts Institute of Technology (United States District Court District of Massachusetts).Text
  27. "Race to Zero". Archived from the original on 2013-06-22. Retrieved 2008-06-09. Contest concept.
  28. McMillan, Robert (April 2008). "Security Vendors Slam Defcon Virus Contest". IDG News Service.
  29. Zetter, Kim. "Malicious ATM Catches Hackers" – via www.wired.com.
  30. Fisher, Dennis; Roberts, Paul (August 10, 2011). "Legal Threat Pushes Former HBGary Federal CEO Out Of DEFCON". Business Security. Archived from the original on 2011-08-10.
  31. Greenberg, Andy. "Watch Top U.S. Intelligence Officials Repeatedly Deny NSA Spying On Americans Over The Last Year (Videos)." Forbes. June 6, 2013. Retrieved on June 11, 2013. "Eight months later, Senator Ron Wyden quoted[...]"
  32. Wagenseil, Paul. "Hackers Don't Believe NSA Chief's Denial of Domestic Spying." (Archive) NBC News. August 1, 2012. Retrieved on June 13, 2013.
  33. Whitney, Lance. "Defcon to feds: 'We need some time apart'". CNET. July 11, 2013. Retrieved on July 12, 2013.
  34. Blue, Violet. "Feds 'not welcome' at DEF CON hacker conference". ZDNet. July 11, 2013. Retrieved on July 11, 2013.
  35. "ForAllSecure | Mayhem Security | Application Security". ForAllSecure.
  36. "DEF CON Capture the Flag Final Scores". blog.legitbs.net.
  37. Joe Uchill (July 29, 2017). "Hackers breach dozens of voting machines brought to conference". The Hill. Thehill.com. Retrieved 2 August 2017.
  38. "DEF CON Hacking Warns Voting Machines Vulnerability, Oct 10 2017 | C-SPAN.org". C-SPAN.org. Retrieved 2017-12-08.
  39. "O'Reilly Security Conference in NYC 2017 Defender Awards". conferences.oreilly.com. Retrieved 2017-12-08.
  40. Hern, Alex; Levin, Sam (August 4, 2017). "Briton who stopped WannaCry attack arrested over separate malware claims". The Guardian. ISSN 0261-3077. Retrieved August 11, 2017.
  41. @VotingVillageDC (6 March 2018). "WOW! Congrats to the @defcon Team, recently honored for its innovative #VotingVillage concept & the continued debat…" (Tweet) – via Twitter.
  42. "DEF CON 28 in-person conference is CANCELLED - DEF CON Forums". forum.defcon.org. Retrieved 2020-05-08.
  43. "DEF CON Safe Mode archive site".
  44. Winn Schwartau. "Cyber Christ Meets Lady Luck" (PDF). Archived from the original (PDF) on 18 July 2011. Retrieved 9 Feb 2011.
  45. "DEF CON® Hacking Conference – Show Archives". www.defcon.org. Retrieved 2016-04-09.
  46. Newman, Lily Hay. "Defcon Is Canceled". Wired. ISSN 1059-1028. Retrieved 2023-02-25.
  47. ""DEF CON Transparency"". August 2018. Retrieved 2018-10-28.
  48. ""Voting Machine Hacking Village"" (PDF). September 2017. p. 4. Retrieved 2018-05-17.
  49. ""Norton at DefCon"". September 2019. Retrieved 2019-09-15.
  50. ""Gray Tier Technologies at DEFCON23"". August 2015. Retrieved 2019-09-15.
  51. Richard Byrne Reilly (2014-08-12). ""Black Hat and Defcon see record attendance — even without the government spooks"". Retrieved 2017-06-07.
  52. "DEF CON 17 FAQ". Retrieved 2018-07-07.

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