Previous Messages Provide the Key to Achieve Shannon Capacity in a Wiretap Channel

TL;DR

This paper demonstrates that using previously transmitted messages as a secret key can achieve the Shannon capacity in a wiretap channel without feedback, enhancing secrecy while maintaining strong secrecy guarantees.

Contribution

It introduces a novel method of leveraging prior messages to reach Shannon capacity in wiretap channels without feedback or additional channels.

Findings

Secrecy capacity can be increased to Shannon capacity using message-based keys.

The method maintains strong secrecy without feedback.

Achieves capacity without additional channel resources.

Abstract

We consider a wiretap channel and use previously transmitted messages to generate a secret key which increases the secrecy capacity. This can be bootstrapped to increase the secrecy capacity to the Shannon capacity without using any feedback or extra channel while retaining the strong secrecy of the wiretap channel.