Privacy-Preserving Spam-Protected Gossip-Based Routing

TL;DR

This paper introduces WAKU-RLN-RELAY, a privacy-preserving gossip routing protocol that effectively prevents spam through cryptographic rate-limiting, ensuring privacy and efficiency in resource-constrained environments.

Contribution

It presents a novel spam protection mechanism using rate-limiting nullifiers within an anonymous gossip protocol, addressing privacy and performance issues of existing schemes.

Findings

Efficient spam prevention with cryptographic rate-limiting.

Maintains user privacy while enabling spammer identification.

Low computational overhead suitable for resource-limited devices.

Abstract

WAKU-RLN-RELAY is an anonymous peer-to-peer gossip-based routing protocol that features a privacy-preserving spam-protection with cryptographically guaranteed economic incentives. While being an anonymous routing protocol where routed messages are not attributable to their origin, it allows global identification and removal of spammers. It addresses the performance and privacy issues of its counterparts including proof-of-work and reputation-based schemes. Its light computational overhead makes it suitable for resource-limited environments. The spam protection works by limiting the messaging rate of each network participant where rate violation results in financial punishment. We deploy the novel construct of rate-limiting nullifier to enforce the message rate limit. We provide a proof-of-concept implementation of WAKU-RLN-RELAY to prove the efficiency and feasibility of our solution.