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@infosecdj@infosec.exchange · Mar 06, 2026

Hello and welcome to the first #nakeddiefriday of this spring. Today we have a family visit; I got several dies from the same manufacturer which is Starchip. I know, hardly heard of them, but they seem to make smartcard chips. They use manufacturer code 0x0081 in CPLC data. The first on is SCF384G, dated 2010. A couple memory arrays, an area at the top where unknown things happen (probably power regulation), and a sea of gates in bottom right. There are also two smaller unbonded pads right next to it.

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@infosecdj@infosec.exchange · Mar 04, 2026

This was for the lapping experiment no.2. I am and will be taking images of every step e.g. when I hit a layer. This is around an hour of lapping work and ~18 hours of imaging the result. So one layer per day if I do everything well unlike yesterday, lol.

See alt text for description.

#reverseengineering

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@infosecdj@infosec.exchange

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@infosecdj@infosec.exchange · Mar 04, 2026

Nothing like a 18hr imaging run ruined by sunlight and some trash on the specimen... Sigh. Here we go again.

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@infosecdj@infosec.exchange · Mar 01, 2026

RE: @redsad@ohai.social

The state holds monopoly on violence. The below is just a corollary of that fact.

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@infosecdj@infosec.exchange · Feb 27, 2026

Does anybody know what elementary file 2FE4 contain on SIM cards? It doesn't look like it is described in any standards I've looked at, and its contents varies widely across cards. Maybe boost for reach? #electronics #smartcards

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@infosecdj@infosec.exchange

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@infosecdj@infosec.exchange · Feb 27, 2026

Hello! It's #nakeddiefriday today, and what I got for you is yet another smartcard chip. Please welcome an unnamed die marked K2D0A, fabbed by STMicro. This came from [REDACTED], used to [REDACTED]. The die oriented with power supply pads on top, so it's possible to figure out which die pads correspond to which module pads. Unusually enough, there are 6 pads bonded out; the function of the extra
pad is not known at this time-- certainly not VPP.

A short thread follows.

#electronics #reverseengineering #smartcards

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@infosecdj@infosec.exchange · Feb 25, 2026

First semi-successful attempt at deprocessing by lapping. The outcome is extremely uneven, with metal2 remains showing over metal1, and a larger corner area being ground down to substrate.

Despite that, it may be possible to recover around half the bits visible in the ROM block. If done more conservatively and with multiple intermediate steps, full recovery can be performed.

#electronics #reverseengineering #deprocessing

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@infosecdj@infosec.exchange · Jan 24, 2026

Anyone here reverse engineered the RunFei RF-3148? #reverseengineering #electronics

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@infosecdj@infosec.exchange · Jan 15, 2026

And finally, this. I have no idea what this is, except that it is Soviet and made using a metal-gate CMOS process. :-) There is two of *something* on the die, and it might be a dual JK flip-flop chip. Unfortunately, that's about as much as I know about it.

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