DEFCON 201 Online CTF Practice — Crypto CTF — August 10th-11th

Welcome to the DEFCON 201 Crypto CTF 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 Saturday, from August 10th 2:00 PM EST to August 11th 2:00 PM EST, we invite all DEFCON 201 Members, Attendees and Fans to help us hack the Crypto CTF 2019!


CTF Time Page:


Anyone can enter by joining our group and entering our DISCORD Chat! Once in chat, select the #CTF channe. 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!

DEFCON 201 Discord Link:


Clear Net:





Android: (We recommend using YALP)

Join The DEFCON 201 CTF Time Group:


Welcome to the Crypto CTF!

Crypto CTF is an online competition for hackers to test, evaluate, and expand their cryptography exploiting skills. In this CTF we will provide various crypto challenges regarding modern cryptography techniques.

All crypto lovers are most welcome

Each task will be based on a particular cryptographic primitive or it will include a direct application of cryptography in other fields.

  • Each team is only allowed to participate under one name.
  • There is no restriction on the number of team members.
  • If you have questions about tasks, ask moderators in IRC chat or Email. No points will be deducted for these questions.
  • If this is the first time you play over, you should know that a flag is a sentence or code that you should find in each level. There is no exact procedure to find them, you have to do several tests and think out of the box to get them. Eventually, you’ll understand the dynamics of the CTF and how to quickly solve challenges.
  • If you are sure your flag is true (we mean %100 SURE), but our system does not accept it, inform us via chat.
  • Reporting bugs in the contest infrastructure has a reward.
  • Thou shalt not be a jerk. We are all here to learn something new.
  • Any attempt to disrupting the contest will result in disqualification.
  • We have a dynamic scoreboard. That means the more teams solve a challenge, the less point each team gets.
  • All flags must be in this form: CCTF{[0–9a-zA-Z_-]+.}, unless the contrary is stated.
  • Flag example: CCTF{_some_l33t_string_l1k3_7hi5_}
  • There would be at least 24 tasks.
  • You can find the latest news and announcements about this contest on the announcements page.
  • Registration will be open until the end of the game.
  • The address of the live chat channel is freenode #cryptoCTF

Long Live Crypto!

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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