What’s happened?

　　The biggest manufacturer of Sim cards in the world has reportedly been hacked into by the US NSA and UK GCHQ.

　　The security agencies stole the encryption keys（密码） that are built into every one of the Sim cards made by the Dutch firm Gemalto.

　　What does this mean?

　　With the encryption keys for Sim cards, the US and UK security services can potentially listen in on any conversation across any network that uses the compromised(缺乏抵抗力的）Sim cards.

　　How could they listen in?

　　The keys allow the security services to decode voice communications sent between a mobile phone and a mobile mast（天线杆）, which carries the call to the receiver. To pick up the call they can use an aerial（天线）placed in the neighbourhood of the caller. They will have to be relatively close to the mobile phone user, but an aerial could be placed anywhere and would not have to be visible.

　　Who is affected?

　　Gemalto supplies 2bn Sim cards annually to 450 mobile phone providers globally across 85 countries. Most mobile phone providers will have used Gemalto Sim cards at some point, meaning anyone with a Sim in their mobile phone could be affected.

　　What can be done?

　　There is very little that can be done . That means someone could be listening in on any conversation had via the mobile phone network.

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