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No relay ever holds plaintext or long-term keys.\n2. **Minimal metadata.** We treat *who talks to whom, when, and how much* as sensitive as\n   content. Servers store nothing they don't strictly need, and we work to hide social\n   graph and timing even from our own infrastructure.\n3. **No identifiers you didn't choose.** Identity is a cryptographic key, not a phone\n   number or email. Trust is established out-of-band (safety numbers / QR).\n4. **Auditable.** AGPL-3.0, reproducible builds (goal), audited crypto libraries — never\n   hand-rolled primitives.\n5. **One core, many shells.** All security-critical logic lives in a single Rust crate so\n   it is written and reviewed exactly once.\n\n## Architecture (short version)\n\n```\nUI shells (egui desktop · WASM web)   →  core crate (Rust)  →  relay network\n                                          identity · E2E crypto    opaque mailbox queues\n                                          messages · onion transport  (self-hostable)\n```\n\n- **E2E crypto:** the audited [libsignal](https://github.com/signalapp/libsignal) library —\n  post-quantum X3DH (PQXDH) + Double Ratchet, with sealed sender for metadata privacy. We\n  never reimplement primitives or the ratchet.\n- **Transport:** asynchronous store-and-forward into per-contact **mailbox queues** that\n  hold only opaque ciphertext, **onion-routed** so no relay learns who talks to whom. No\n  real-time channels; everything is delivered when the recipient next connects.\n- **Local storage:** encrypted-at-rest (SQLCipher), keys sealed by the OS keychain.\n\nSee [ARCHITECTURE.md](ARCHITECTURE.md) and [THREAT_MODEL.md](THREAT_MODEL.md).\n\n## Roadmap\n\n| Phase | Scope | State |\n|-------|-------|-------|\n| 0 | Cryptographic core: identity, PQXDH, Double Ratchet (libsignal) | done |\n| 1 | Message protocol: text/image/file/voice-clip types, framing, attachment chunking, all E2E | done |\n| 2 | Private mailbox queues, out-of-band invitations, and a networked relay (`services/relay`) | done |\n| 3 | Onion routing across relays (hide the social graph) | done |\n| 4 | Persistent encrypted store (SQLCipher) + safety-number / QR verification UX | next |\n| 5 | Desktop (egui) and web (WASM) clients; release binaries; hardening | in progress |\n\n## Building\n\n```sh\ncargo test            # run the core test suite\ncargo build --release # privacy-minded release profile (stripped, panic=abort, LTO)\n```\n\nRequires the pinned Rust toolchain and `protoc` (libsignal compiles protobuf\ndefinitions at build time). See [CONTRIBUTING.md](CONTRIBUTING.md) for setup.\n\n## Security\n\nFound a vulnerability? **Do not open a public issue.** See [SECURITY.md](SECURITY.md)\nfor coordinated disclosure.\n\n## License\n\n[AGPL-3.0-or-later](LICENSE). The network-use clause is deliberate: anyone running a\nmodified server must publish their source, so the privacy guarantees stay verifiable.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fryannzander%2Fhush","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fryannzander%2Fhush","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fryannzander%2Fhush/lists"}