Gertrude + SoundLinks Hybrid Model

Secure Acoustic Communications for Submarines (One-Pager)

🔍 Overview

Combine Gertrude’s underwater voice channel with SoundLinks’ inaudible Digital Identity (DID) embedding. Operators keep speaking normally; machines verify origin, integrity, and short mission tokens in real time.

🎙️ Baseline (Gertrude)

• Medium: Acoustic (sonar-like voice in water)
• Purpose: Real-time voice between subs/ships
• Range: Few–tens of km (env. dependent)
• Weakness: Interceptable/spoofable; reveals activity

🔊 SoundLinks Layer

• Embedding: Psychoacoustically masked, inaudible data in the audio waveform
• Security: DID + timestamp + nonce + MAC/signature (optionally ledger-anchored)
• Payload: Ultra-compact tokens (IDs, brevity codes, IFF flags)
• Reqs: Embed/extract software on comms suite endpoints

⚡ Protocol Stack

1. Voice (Gertrude) → human intelligibility