Tessera is an open-source privacy protocol for authenticated, metadata-private messaging. It combines Schnorr zero-knowledge proofs, per-recipient key blinding, and (ε,δ)-differentially-private cover traffic to hide who is talking to whom — with no central authority.
Authenticated messaging that hides communication metadata (who talks to whom) without trusting a central server.
tessera is one option in a category that includes Signal, Tor , and mix networks. Our Compare page has the full side-by-side.