key generation on SIM failed (cause 2)

Sylvain Munaut 246tnt at gmail.com
Thu Apr 5 12:16:08 UTC 2012


Hi,

> SIM is new. It works if you start phone without osmocom. And It also works
> if you start without osmocom and when SIM logs into network you restart the
> phone with osmocom.
>
> We tried several new cards and there was always same result. There is also
> no PIN set up (SIM is not locked). We tried with USIM.
>
> When we try old cards (>2 years old) osmocom works without problem.
>
> Have you ever encountered this kind of trouble? Is there any fix for it?

Interesting. Purely from the "symptoms", I'd guess that the sim starts
in USIM mode and somehow needs to switch into SIM mode to work with
plain old GSM.
My understanding is that the SIM should do that on its own, but
apparently doesn't. And then when you start the official fw, it's
properly switched to SIM mode and then you can start osmocom. (I guess
maybe capacitors keep VCC high enough for the sim to survive a reboot
? altough it still should be reset).

Just a theory ... (and not a perfect one at that).

Do you have a simtrace to make captures of what's on the wire when
talking to the original fw / osmocom and compare ?
Can you spare a SIM ?

Cheers,

    Sylvain




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