this post was submitted on 20 Jan 2024
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Website is completely borked on my phone on Firefox
That's strange, trying a few permutations here and I can't get it to break. But at any rate, here's the content:
[embedded players for sound files]
About
Play the below sounds through your phone speaker and hold it next to a Gatekeeper Systems wheels to lock/unlock. Check me out on twitter @stoppingcart
How It Works
Most electronic shopping cart wheels listen for a 7.8 kHz signal from an underground wire to know when to lock and unlock. A management remote can send a different signal at 7.8 kHz to the wheel to unlock it. Since 7.8 kHz is in the audio range, you can use the parasitic EMF from your phone's speaker to "transmit" a similar code by playing a crafted audio file. Link to my original DEFCON 29 Talk
Button to Download Audio Files
Thanks a lot! Funny thing is that the website works fine now, something must've been bugged
Here is an alternative Piped link(s):
Link to my original DEFCON 29 Talk
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source; check me out at GitHub.