DJ🌞3d ago

Hello and welcome to the #nakeddiefriday again. This one will be a continuation of the previous one with the same exhibit but in more depth. :-)

To remind you, this is the unnamed smartcard IC, which I believe was fabbed by Samsung.

Let's try removing some metal from the top. 🧵

#electronics #reverseengineering #smartcard

Show threadDJ🌞3d ago

Interestingly, the thick infill area was way more resistant to the lapping process and the majority of metal-3 remained there, while the rest got stripped off.

There is a lot of analog circuitry on the bottom and right sides of the chip. I am not sure why there is so much and what it does exactly.

Show threadDJ🌞3d ago
A detail view on the analog section; the features on the right seem to be four resistor arrays of the same value, and those on the left are multiple capacitors connected in parallel. I wonder why they decided to make multiple separate parts instead of making a large one of required geometry.
Show threadDJ🌞3d ago
A detail view of the sea of gates. Note the difference in the shade of blue.
Show threadKasTas
@infosecdj oh boy, just the sea to make a puzzle of!
Mar 20 at 2:08pmWeb
Show threadKasTas3d ago
@infosecdj for example on a bit bigger scale :)