Untraceable VoIP Communication based on DC-nets

TL;DR

This paper introduces a low-latency, fault-tolerant untraceable VoIP communication method using DC-nets, suitable for small groups and potentially scalable to larger systems.

Contribution

It presents a novel DC-net based approach for untraceable VoIP with resilience to packet loss and malicious interference, addressing latency issues of traditional anonymization systems.

Findings

Achieves low latency suitable for VoIP

Provides resilience against malicious packet injection

Proposes a P2P implementation for small groups

Abstract

Untraceable communication is about hiding the identity of the sender or the recipient of a message. Currently most systems used in practice (e.g., TOR) rely on the principle that a message is routed via several relays to obfuscate its path through the network. However, as this increases the end-to-end latency it is not ideal for applications like Voice-over-IP (VoIP) communication, where participants will notice annoying delays if the data does not arrive fast enough. We propose an approach based on the paradigm of Dining Cryptographer networks (DC-nets) that can be used to realize untraceable communication within small groups. The main features of our approach are low latency and resilience to packet-loss and fault packets sent by malicious players. We consider the special case of VoIP communication and propose techniques for a P2P implementation. We expose existing problems and sketch possible future large-scale systems composed of multiple groups.