The transaction can use several protocols, from a simple secure TLS channel to send a credit card number until a sophisticated payment protocol.

本次交易可以使用多种协议，从简单的安全TLS通道发送信用卡号码，直到一个复杂的支付协议。

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It works by detecting when a botnet virus is communicating with its master servers, as it must do to get its commands or to send back data — say, your passwords and credit card Numbers.

由于僵尸网络病毒必须与主服务器通信来获得命令或返回数据——比如，密码和信用卡号码，通过侦测此过程该技术便能发挥作用。

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If Spain falls into crisis, the entire credit system in Europe could grind to a halt and that would send tremors throughout the world's financial system.

如果西班牙也陷入危机，欧洲的整个信用体系将慢慢停止运转，那会震动世界金融体系。

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The introduction of Me2U, a service that allows callers to use text-messaging to send airtime credit to other mobiles, provided a further boost.

ECONOMIST: Business in Africa

These typically do not charge for app-to-app calls, but do require the user to buy credit if they want to call or send a text to a standard mobile or landline number.

BBC: O2's Tu Go aims to challenge Skype and other Voip apps

This, they say, would send a chill through secondary markets, cutting credit to thousands of worthy borrowers.

ECONOMIST: Securitisation