What 1 wants to say in plain english is that, there is a network system called Echlon which picks up e-mail's with dangerous words in it.
The aim is obviously to prevent crimes, hacks and murders but there is a problem of privacy; e-mails will be seen without any warnings or traces.
As a result many people are against this idea and Cipherwar is one of them.
There aim is to send loads of e-mails with words which will get filitered by Echelon and hence make it difficult for the "Echelon people" to detect the important e-mails.