Universal Secure Network Coding via Rank-Metric Codes

TL;DR

This paper introduces a universal secure network coding scheme based on rank-metric codes that guarantees information-theoretic security against eavesdroppers and can be extended to handle errors and rank deficiencies, achieving optimal rates.

Contribution

The paper proposes a universal secure network coding scheme using rank-metric codes that works without network modifications and achieves maximum secure rates.

Findings

Achieves maximum rate of n-0 packets for secure communication.

Extends to handle errors and rank deficiencies with optimal rate n-0-0- 0 packets.

Scheme is universal, requiring only packet length at least n, with proven necessity.

Abstract

The problem of securing a network coding communication system against an eavesdropper adversary is considered. The network implements linear network coding to deliver n packets from source to each receiver, and the adversary can eavesdrop on \mu arbitrarily chosen links. The objective is to provide reliable communication to all receivers, while guaranteeing that the source information remains information-theoretically secure from the adversary. A coding scheme is proposed that can achieve the maximum possible rate of n-\mu packets. The scheme, which is based on rank-metric codes, has the distinctive property of being universal: it can be applied on top of any communication network without requiring knowledge of or any modifications on the underlying network code. The only requirement of the scheme is that the packet length be at least n, which is shown to be strictly necessary for universal communication at the maximum rate. A further scenario is considered where the adversary is allowed not only to eavesdrop but also to inject up to t erroneous packets into the network, and the network may suffer from a rank deficiency of at most \rho. In this case, the proposed scheme can be extended to achieve the rate of n-\rho-2t-\mu packets. This rate is shown to be optimal under the assumption of zero-error communication.