EFPIX (Encrypted Flood Protocol for Information eXchange) is a flood-based relay protocol for encrypted, metadata-resistant, and spam-tolerant communication designed for secure, anonymous and delivery-critical communication. By default, messages are end-to-end encrypted, and metadata is hidden from relaying nodes, while proof-of-work, deduplication, and aging deter spam and replay without requiring accounts or trusted authorities. The protocol is topology-agnostic, resilient to infrastructure failures, and requires no central server.
- Topology-Agnostic: Works over any network structure and survives infrastructure loss, censorship, and dynamic topology changes.
- End-to-End Encryption: Protects both content along with signatures.
- Metadata Resistance: No metadate outside of encrypted blob.
- Spam Tolerance: Proof-of-Work and deduplication limit flooding abuse.
- Optional Enhancements: Broadcasts, Links, Verifiable Delay Functions (VDFs), and more.
- Secure whistleblower and journalist file drops
- Activism and censorship-resistant messaging
- Disaster recovery and infrastructure-loss scenarios
- Military communication
- General-purpose privacy-first peer-to-peer messaging
It is best suited for asynchronous, privacy-critical communication such as secure email, file drops, offline messaging, and distributed alerts.
The complete technical specification, threat model, and example instantiation are available here:
EFPIX Whitepaper (PDF)