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arXiv:2509.08248cs.CR

EFPIX: An Encrypted Flood Protocol for Metadata-Resistant Communication

Arin Upadhyay

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Abstract

We propose EFPIX, a flood-based relay protocol for encrypted, metadata-resistant, and spam-tolerant 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. It is designed for asynchronous privacy-critical communication, where anonymity and resilience matter more than throughput.

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DOI
Subjects
cs.CRCryptography and Security cs.NINetworking and Internet Architecture

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  • Show HN: Efpix – A flood protocol with E2EE and metadata protection2 points0 comments

    I wrote a protocol and C implementation for communication in "zero-infrastructure" and high-adversity environments. 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…

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