Users can separately encrypt their voice and text communications using messaging services such as Apple’s iMessage, Facebook’s WhatsApp or similar secure services.

　　29. What happened?

　　A US and UK spy agencies listened in on billions of mobile phone calls from around the world.

　　B Sim card database hack gave US and UK spies access to billions of cell phones.

　　C the Dutch firm Gemalto gave away the encryption keys that are built into every one of the Sim cards.

　　D Edward Snowden and Glen Greenwald’s The Intercept stole the encryption keys from Gemalto.

　　30. How could the US and UK spy agencies listen in?

　　A They use a mast to receive and decode the call.

　　B They use an aerial to receive and decode the call.

　　C They use an aerial to receive the call and the encryption keys to decode the call

　　D They use a mobile mast to receive the call and encryption keys to decode the call.

　　31. Who is possibly affected?

　　A One who doesn’t use a Sim card made by Gemalto.

　　B One who separately encrypts his voice and text communications using messaging services

　　C One who stays far away from any aerial.

　　D One who is at conversation via the mobile phone network.

　　参考答案29---31 BCD

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