this post was submitted on 13 Jun 2023
8 points (100.0% liked)
Technology
37608 readers
218 users here now
A nice place to discuss rumors, happenings, innovations, and challenges in the technology sphere. We also welcome discussions on the intersections of technology and society. If it’s technological news or discussion of technology, it probably belongs here.
Remember the overriding ethos on Beehaw: Be(e) Nice. Each user you encounter here is a person, and should be treated with kindness (even if they’re wrong, or use a Linux distro you don’t like). Personal attacks will not be tolerated.
Subcommunities on Beehaw:
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Yikes! I wonder how isolated the led has to be to the CPU power supply to prevent this sort of attack!
Placing a capacitor in parallel with the LED should be sufficient to prevent it. That would form a low pass filter when combined with the current limiting resistor for the LED.
The attack is not really practical though. The smart card has to be read for 65 minutes while recording the power LED. The cards are normally only read for a fraction of a second.