Comment by jacquesm
17 days ago
The link you want:
https://grandideastudio.com/portfolio/security/ledger-hardwa...
They should have posted the weight with and without the device in it.
Also: never leave empty space in a hardware key, pot the whole thing in epoxy.
No, this is May version. If you look at the twitter thread, the October version is different and looks much more "stock"
(sadly I have not found nice website with newer version photos yet)
I heard they reduced the battery size to make space for their chip.
Yes, hence the potting. You'd have to figure out a way to open the device without breaking it.
When there are millions of dollars to be stolen, someone can figure out how to remove the potting.
If need be, just grind and cut till you are back to the one silicon wafer that contains crypto keys, then rebuild the whole lot from scratch, add your evil parts, then re-pot it.
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It's stupidly easy to open the device. I opened mine last night with a knife and a hairdryer. I left no perceptible marks either. I watched a few videos where the device was opened without a hairdryer. Apparently, those who did the implant put more glue than Ledger itself.
Well, still a safer reason for clandestinely reducing the size of a battery in a mobile device many people carry around close to their body.
Interesting. Everyone that read the article also heard that.
This one too (pardon the AI slop): https://www.tibane.net/research/ledger-nano-x-implant
Ah good one, more useful info in that one. That kapton circuit might be traceable to whoever ordered it.
And the Vodafone NL SIM could also offer some leads
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This is May version. If you look at the twitter thread, the October version is different and looks much more "stock"
These recent teardowns of compromised Ledger wallets are frightening. Because the infiltration of hardware looks very pro. Mass production and standardized parts added.
Even weight difference might not be obvious. He compared weights for one Ledger product but the small variations in weight among genuine devices made comparisons not clear.
Possibly only X-ray would uncover the fake without cracking the case?
https://youtube.com/@MagicalTux
(Warning - MagicalTux is Tibanne or Mark Karpeles. He has a “complicated” legal history, but this looks legit)
They could x-ray it, carve out epoxy with nothing inside, put the logger, apply epoxy.
Not that easy. The potting epoxies made for this purpose are nothing like your regular epoxies. They're pricey and when you try to break them you are very likely to tear the parts right off the board. This is the brand I have used in the past:
https://www.masterbond.com/techtips/tamper-resistant-potting...
The devices we made were put in places where there was a significant risk of tampering and to the best of my knowledge nobody ever managed to break the epoxy bond to the point that the circuit was still functional. But as I wrote above: not cheap.
Is that safe for devices containing a lithium battery?
Good question: the battery here doesn't look like it had any room for expansion so it wouldn't be worse per se. But normally you want a little bit of room around a battery, I guess a thin foam liner would allow for that and would still allow you to pot the whole thing.
Worst case, a bloating battery cracking open a plastic enclosure or being able to vent gas through the gaps in one would be preferable too, right?
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Take off the case, put your own entire module in, put the case back in. Epoxy doesn't solve much.
...frankly, selling one as DIY kit have highest chance for tamper resistance. Tho pretty untenable with small SMD components sadly