I wouldn't read the word "silence" in this article as a precise term. Check out their abstract/paper: http://www.usenix.org/events/sec11/tech/tech.html#Gollak

I wouldn't read the word "silence" in this article as a precise term. Check out their abstract/paper: http://www.usenix.org/events/sec11/tech/tech.html#Gollakota http://www.usenix.org/events/sec11/tech/tech.html#Gollakota The abstract says they've made it work on busy networks.