Riffle starts by sending the message to every server in the network. The onion analogy has to do with layers of skins - a sending computer encrypts the message multiple times and as it passes through each server, one layer of encryption is removed. Riffle keeps that aspect, building upon it in a novel way. The strength at the core of Tor is the Onion Routing that makes up the last two letters the network’s name. You can dig into the whitepaper but the MIT news article does a great job of providing an overview. Researchers at MIT and the École Polytechnique Fédérale de Lausanne think they have found a better way in a system called Riffle.
Tor is the household name in anonymous networks but the system has vulnerabilities, especially when it comes to an attacker finding out who is sending and receiving messages.
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