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Date: Wed, 15 Apr 1998 14:53:32 -0700 From: Eric Blossom <eb@comsec.com> To: daw@cs.berkeley.edu Cc: cryptech@Mcs.Net, cryptography@c2.net In-Reply-To: <199804150122.SAA02021@joseph.cs.berkeley.edu> (message from David Wagner on Tue, 14 Apr 1998 18:22:46 -0700 (PDT)) > So it's not clear if there are any circumstances under which two > identical phones could be on the network at the same time; but I > don't think that's really relevant to fraud management. > > For fraud, the critical question is whether any ``giant red flashing > lights'' go off in the provider's fraud center when two duplicate phones > are in use -- and it's not clear whether any GSM providers actually > have such alarms in place. > > Remember that the GSM system was *designed* so you could use your > SIM with multiple different handsets, as you travelled. This doesn't > rule out the possibility of fraud-detection; but it makes it slightly > more plausible that a cloned SIM might be able to escape detection. > > Maybe someone who knows more about GSM networks can help us figure > out whether the above speculations are accurate. Why don't you just try it out? I assume that you've got a SIM emulator that you can use to emulate the cloned SIM. See what happens. Shouldn't take too long to find out. Eric
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