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息的过程。

In other words, it’s the same process for encrypting and decrypting; you just have to make sure the sending and receiving machines have the same initial configuration.

换句话说，加密和解密是同一个过程；您只需确保发送和接收机器具有相同的初始配置。