The cellphone then responds by sending back an error message carrying a signature that can be distilled to reveal a 56-bit Data Encryption Standard key. "The cards protect the mobile identity of subscribers, associate devices with phone numbers, and increasingly store payment credentials, for example in NFC-enabled phones with mobile wallets."Īn attacker, Security Research Labs explains, begins by sending an unrecognizable, binary text message usually meant to carry user logs and telephone settings to a victim's phone. "SIM cards are the de facto trust anchor of mobile devices worldwide," the Berlin company said in a blog post. Security Research Labs founder Karsten Nohl will present the research at the BlackHat Conference later this month in Las Vegas.
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