While some seven billion SIM cards are in use today, Nohl estimated that roughly half a billion mobile devices worldwide would currently be vulnerable to this type of attack. The impact of hacked SIM cards, one of the few stalwarts in the high-tech industry that has not seen a serious exploit, could be monumental. The error message contained all the information needed to spoof the SIM card of that particular phone. Karsten Nohl was able to spoof a text message from the cellphone provider on various phones and receive an error message in return. A German cryptographer named Karsten Nohl will be presenting findings to that effect at the annual Black Hat computer security conference at the end of the month. ![]() More than 20 years after its initial inception, the SIM card has been hacked.
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