idea for a fun little security project

Werner Almesberger werner at almesberger.net
Thu Nov 20 01:15:53 UTC 2014


Felix wrote:
> Is then the dot under the chip?

Don't give them ideas ! :)

The dot is in the lower left corner, as one can see here

http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd1-top-0728.jpg
or here
http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd1-top-0818.jpg

These two are 48-QFN. For 32-QFN, they decided to make it a bit
harder to find, moved it away from the corner, and made it look
like a part of the rest of the text of the package marking:

http://downloads.qi-hardware.com/people/werner/anelok/tmp/ybox2-0-pcba-bot.jpg

They'll probably use camouflage paint in the next edition.

And this is where pretty much all of the competition puts it:

http://downloads.qi-hardware.com/people/werner/anelok/tmp/ybox2-0-pcba-top.jpg
http://downloads.qi-hardware.com/people/werner/wpan/tmp/2boards-20110305-full.jpg
http://downloads.qi-hardware.com/people/werner/uart/pix/uart-20110131.jpg

> You mean, be able to program the second chip through the first chip
> bootloader, no?

Yup. Like here, but replacing the cable with traces:

http://downloads.qi-hardware.com/people/werner/anelok/tmp/kltab-pgm.jpg

- Werner



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