> Vuvuzela is secure against adversaries that observe and tamper with all network traffic, and that control all nodes except for one server. Vuvuzela’s key insight is to minimize the number of variables observable by an attacker, and to use differential privacy techniques to add noise to all observable variables in a way that provably hides information about which users are communicating.

Someone watching all traffic will know that you're using Vuvuzela, but won't be able to figure out who you're communicating with. In Tor, generally if someone can see all traffic they can rapidly trace communication links-- it's encrypted, but the fact that you send packets and induce a chain of a few other packets to the target is a dead giveaway.