"We need secure, robust communication systems for medium sized groups of people (think revolutionaries) that don't need to rely on centralized (government owned) networks. Possibly use UDP to message someone (since without ACKs you can send to many hosts, and a listening host looks the same to the network as an unrelated host). More ideas about this in passage: "Right, so you send it to random internet hosts"

This is why sender spoofing should also be considered a feature and not a flaw.