Here’s what’s going on: Carriers collect location information from cell phone towers and share it with each other through a global network called SS7. This allows a US carrier to find a customer even if she hops a plane to India. But according to thePost, surveillance systems makers have gained access to SS7 and are using it to grab location data, allowing these firms to pinpoint people within a few city blocks.
It’s not clear how private surveillance companies have obtained access to the network. Major cell carriers sell SS7 access to other providers, as do third party companies. Karsten Nohl, a cryptographer and telecommunications researcher based in Berlin, says that these players, some of their business partners, and “anybody hacking any of the above” can send and receive SS7 messages. Albert Gidari Jr., an attorney at Perkins Cole who specializes in privacy and technology, says that it’s likely that a surveillance company could get access by representing itself as a provider.
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