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https://github.com/davidlazar/vuvuzela
Vuvuzela is a messaging system that protects the privacy of message
contents and message metadata. Users communicating through Vuvuzela do
not reveal who they are talking to, even in the presence of powerful
nation-state adversaries. Our SOSP 2015 paper explains the system, its
threat model, performance, limitations, and more. Our SOSP 2015 slides
give a more graphical overview of the system.
Vuvuzela is the first system that provides strong metadata privacy
while scaling to millions of users. Previous systems that hide
metadata using Tor (such as Pond) are prone to traffic analysis
attacks. Systems that encrypt metadata using techniques like DC-nets
and PIR don't scale beyond thousands of users.
Vuvuzela uses efficient cryptography (NaCl) to hide as much metadata
as possible and adds noise to metadata that can't be encrypted
efficiently. This approach provides less privacy than encrypting all
of the metadata, but it enables Vuvuzela to support millions of users.
Nonetheless, Vuvuzela adds enough noise to thwart adversaries like the
NSA and guarantees differential privacy for users' metadata.
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