Presented at
DEF CON 30 (2022),
Aug. 13, 2022, 9 a.m.
(240 minutes).
In a world of decreasing privacy, it's important that users can communicate P2P without any reliance on centralized solutions. But how do computers connect directly to each other without having external IP addresses, using an insecure protocol like UPnP, manually port forwarding, or routing through intermediary services like Signal, Skype, or Telegram? The traditional solution to this problem has been to trust companies and just route our data though their servers. We can totally trust them, right? If the future of secure communication depends on companies to route our traffic, then I would argue that the future of communications is insecure. There must be a better solution more in line with privacy fundamentals.
Reverse Network Tunneling, i.e. UDP Hole Punching, is a powerful technique that makes it possible for computers with internal IP addresses that are inaccessible on the Internet to be able to connect to each other directly, and therefore become accessible. As crazy as this sounds, it's real and works. This has multiple applications in the real world, such as allowing a pentester to directly connect to a victim that is hidden behind a router. Network tunneling also invalidates the need of centralized services provided by companies that log, surveil and profit from our traffic. Imagine how the future of secure communications would change if all of our online interactions were off-the-grid?
This workshop shows you how to punch holes through external routers to allow computers that were once hidden from the Internet to connect to each other P2P. If you've ever wanted to tunnel into private networks and access internal computers, then this workshop is for you. Create a botnet, backdoor, or even the next great privacy app - the sky's the limit! This is a beginner-level, technical workshop and requires that attendees have some prior experience in at least one programming language, such as Python, JavaScript or C++. Bring your laptop and a strong appetite for pwning network devices.
Materials:
Laptop with Windows, Linux, or OSX. USB flash drive for copying program materials (optional).
Prereq:
Previous experience in at least one programming language is required. Previous experience with Python or C/C++ is recommended, but not required.
Presenters:
-
Cam
- Developer, Hacker
Cam is a developer and hacker with experience in C++, Java, and Android. He has spent the past 5 years writing software for secure communication platforms including VOIP and messaging services. In his free time, he enjoys Android reverse engineering, studying Mandarin, and writing software for human rights projects.
-
Eijah
- Founder
Eijah is the founder of Code Siren, LLC and has 20+ years of software development and security experience. He is also the creator of Demonsaw, an encrypted communications platform that allows you to chat, message, and transfer files without fear of data collection or surveillance. Before that Eijah was a Lead Programmer at Rockstar Games where he created games like Grand Theft Auto V and Red Dead Redemption 2. In 2007, Eijah hacked multiple implementations of the Advanced Access Content System (AACS) protocol and released the first Blu-ray device keys under the pseudonym, ATARI Vampire. He has been a faculty member at multiple colleges, has spoken at DEF CON and other security conferences, and holds a master’s degree in Computer Science. Eijah is an active member of the hacking community and is an avid proponent of Internet freedom.
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