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. /j
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