EFPIX (Encrypted Flood Protocol for Information eXchange) is a topology-agnostic flood-type relay protocol that also achieves end-to-end encryption, plausible deniability for users, untraceability of messages, spam resistance and other optional features. It is designed for environments where you cannot trust the network topology or network participants. Unlike Tor or I2P, it doesn't rely on stable circuits or central directories.

Use cases: - Space, research, military, or other remote networks where the existence and maintenance of a server is not feasible - Disaster zones where network infrastructure was lost - Authoritarian Regimes for whistleblowing, journalism and activism where communication is surveilled and censored - Broadcasts like emergency rescue calls, disaster warnings, and news distribution

I have written a whitepaper (use case + motivation, encoding + decoding algorithm, optional enchancements, threat analysis, comparison with other protocols, etc.). I am looking for feedback.

AMA.

Whitepaper: https://arxiv.org/abs/2509.08248 Implementation: https://github.com/shinymonitor/libefpix Blog: https://shinymonitor.github.io/projects.html