Here's a diagram that basically shows the process for encrypting and decrypting messages.

这个图解表示了加密和解密信程。

The Colossus was installed at Bletchley Park, in the UK, and helped to decrypt Nazi communications.

Colossus 被安装在英国布莱切利园，用来帮助解密纳粹通信。

I did scan them and look at the picture, could decrypt a few cities like Anchorage for example.

我对这些照片进行了扫描，看着它们可以认出像安克雷奇这样几个城。

It is naive to think that signals-intelligence agencies, whose job is to intercept and decrypt messages, are not going to try to do everything to ensure that they can read as much encoded traffic as possible.

信号情报机构工作就是截获并破译情报信，有人认为这些机构并不会尽其全力确保它们能够尽可能阅读更多加密流量，这种想法是天真。