Dual SIM?

Joerg Reisenweber joerg at openmoko.org
Thu Jun 12 18:55:10 CEST 2008

Am Do  12. Juni 2008 schrieb David Pottage:
> On Thu, June 12, 2008 3:21 pm, Bumbl wrote:
> > would it, in theory, be possible to emulate a 2nd sim-card which was
> > inserted and saved on the flash memory before and switch between it
> > and the inserted one?
> In theory this is possible if you can extract the 128 bit crypto key
> inside the SIM which is used to authenticate the SIM card to the
> network. Because of weaknesses in the crypto algorithms used by GSM it
> is possible to extract that secret from a SIM card using about 60 000
> chosen challenges, which can be done in about 12 hours. (assuming the
> SIM card does not have a retry counter)
> If you manage to do all of that, then yes you could have as software
> copy of one or more SIM cards and switch between them, thought the GSM
> module will only ever be able to use one at a time.

And our GSM-module uses the card inserted in the reader by directly connecting 
to it, in the first place. You probably could emulate sim-auth profile over 
BT to the AT-port of GSM-module, though.

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