"Metadata absolutely tells you everything about somebody’s life. If you have enough metadata, you don’t really need content" Stewart Baker, former NSA General Counsel

That's why Briar protects not only against Content surveillance, Content filtering, Takedown orders, Denial of service attacks but also Metadata surveillance.

Briar uses the Tor network to prevent eavesdroppers from learning which users are talking to each other. Each user’s contact list is encrypted and stored on her own device.

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