Background
In an age where convenience is king, I often wonder about the security of everyday wireless devices—until something goes wrong. This curiosity led me to create a1100K, a GitHub repository dedicated to exploring vulnerabilities in commercial garage door openers and other common devices. As a security enthusiast, I wanted to uncover how even simple devices can be exploited when not properly secured.
Frequey, the official mascot of a1100k
About a1100K
a1100K—named after the OOK (On-Off Keying) modulation used in many low-frequency communication protocols—serves as my centralized hub for radio frequency hacks. One of its standout tools is the De-Bruijn-powered RF hacker, designed to analyze and brute-force frequencies in devices like garage door openers. This tool demonstrates how straightforward it is to reverse-engineer signals and identify security gaps in the devices I casually rely on.
RF analyzer in action, capturing and testing various frequencies.
The Math Behind the De-Bruijn Sequence
A De-Bruijn sequence is a cyclic sequence where every possible combination of a given length occurs exactly once. This is crucial in brute-forcing radio frequencies because it allows me to systematically test every possible signal combination without repeating patterns. For example, instead of sending every signal variation one by one, a De-Bruijn sequence optimizes the process by embedding all combinations into a single continuous signal. This is computationally efficient, especially for devices like garage doors that don’t use encrypted or dynamic codes.
A De Bruijn sequence efficiently encodes every possible subsequence of a given length within a continuous string, making it an ideal tool for exhaustive signal testing, such as brute-forcing RF codes with computational efficiency.
Image source: Wikipedia's page on De Bruijn sequences.
Current Highlight: De-Bruijn Tool for Arduino & Flipper Zero
My latest tool leverages the De-Bruijn sequence to capture and test frequency combinations quickly, turning devices like Arduino and Flipper Zero into powerful, compact frequency capturers. With just a few lines of code, users can brute-force through potential frequencies and assess how easily certain wireless signals can be compromised.
Arduino and Flipper Zero used as frequency capture devices.
Educational Use Only
While a1100K is an educational project, it's also a reminder that the freedom to hack comes with responsibility. This repository serves as a tool to understand vulnerabilities, but all users must ensure compliance with local laws and use this knowledge ethically. So remember: hack wisely, test on your own stuff, and use these insights to advocate for better security in my connected world.
Get Involved
Interested in exploring RF security with a1100K? Check out the repository on GitHub, tinker with the tools, and join the conversation on raising awareness about the vulnerabilities in the devices I use every day. Together, I aim to push for a future where security isn’t just an afterthought.