DEFCON 201 Online CTF Practice Challenge — justCTF — December 20th~22nd

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Welcome to the DEFCON 201 justCTF Practice Challenge!

For over two years we have been planing running our own Wargames and CTF to help people develop their hacking skills. While progress is still being made (we plan to launch our own in Winter 2019), DC201 will also occasionally enter into various online CTF Tournaments to test our skills and to get a sample on how one is set up so we have a blueprint in creating our own.

This Friday, from December 20th 3:00 PM EST to December 22nd 4:00 AM EST, we invite all DEFCON 201 Members, Attendees and Fans to help us hack the justCTF 2019!

NOTE: This is also happening DURING our DEFCON 201 Meet Up for December 2019! If you are in New Jersey and want to get the prepare and participate in-person for this CTF check out our meet up here:


CTF Time Page:


Anyone can enter by joining our group and entering our DISCORD Chat! Once in chat, select the #CTF channel. Our Discord will have our Team Invite passphrase. When registering your username, select “I have an invitation code to an existing team” and enter the passphrase posted in our Discord #CTF chat. You are then ready to hack away!

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DEFCON 201 Discord Link:


Clear Net:





Android: (We recommend using YALP)

Join The DEFCON 201 CTF Time Group:

Join The DEFCON 201 Team Page:


  1. Each team is allowed to participate under one account and each member must belong to exactly one team. Teams may consist of any number of members.
  2. During the contest, sharing flags, solutions, hints or asking for help outside the team is prohibited.
  3. If you have questions about challenges or you believe that you found a correct flag, but the system is not accepting it, ask organizers on chat or via e-mail Do not brute-force flag validation endpoint.
  4. Attacking the infrastructure or any attempt to disrupt the competition is prohibited.
  5. Please, report any bugs you find in the infrastructure or tasks directly to the organizers.
  6. Breaking any of the above rules may result in team disqualification.
  7. We have a custom dynamic scoring system, which means that the challenge’s points depend on the number of its solves. We will embed the equation before the CTF starts.
  8. All flags fall into the following format: justCTF{something_h3re!}, unless the challenge description states otherwise.
  9. Challenges might be released at different times, but it is guaranteed that all of them will be released no later than 10 hours before the end of the competition.
  10. The live chat address will be announced on the CTF page.
  11. All crucial information about challenges or the competition will be announced in the news section on the CTF page and on the corresponding channel on the live chat.
  12. Registration will be open before and throughout the competition.
  13. The competition will last for 37 hours straight.
  14. During the last hour, the scoreboard will be frozen until the end (its changes won’t be available for players). However, points for tasks will be updated at all times.
  15. The presented set of rules might change before the start of the competition.
  16. In order to receive the prizes, winning teams may be asked to submit write-ups in 10 business days after the end of the competition.
  17. Resolving any unregulated cases remains on organizers’ discretion.
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Happy Hacking!


North East New Jersey DEFCON Group Chapter. Dirty Jersey Represent! We meet at Sub Culture once a month to hack on technology projects!

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