Transport Skins: How We Hide in Plain Sight

Technical deep dive into DPI evasion techniques used in the Libertaria L0 transport layer.

transportDPIQUICDNSprivacytechnical

Transport Skins: How We Hide in Plain Sight

Deep Packet Inspection (DPI) is the enemy of sovereign communication. Governments and ISPs use it to:

  • Block VPN protocols
  • Throttle encrypted traffic
  • Detect “unauthorized” applications

Transport Skins are our answer.

The Core Idea

Your sovereign traffic should look like normal web browsing. Not just encrypted – indistinguishable.

Skin Architecture

┌─────────────────────────────────────┐
│ Application │
│ (Messaging, File Transfer) │
└──────────────┬──────────────────────┘
┌──────────────▼──────────────────────┐
│ Libertaria Wire Format │
│ (LWF - Binary, Efficient) │
└──────────────┬──────────────────────┘
┌──────────────▼──────────────────────┐
│ Transport Skin │
│ (MIMIC_DNS / MIMIC_HTTPS / QUIC) │
└──────────────┬──────────────────────┘
┌──────────────▼──────────────────────┐
│ Network Layer │
└─────────────────────────────────────┘

The LWF (Libertaria Wire Format) stays constant. Only the wrapping changes.

MIMIC_DNS: The DNS Tunnel

Use case: Networks that only allow DNS queries.

// Subdomain encoding: data → dictionary words
"hello""libertaria.future.exit.node.app"
  • Uses DNS-over-HTTPS (DoH)
  • Base32-encoded subdomains
  • Looks like legitimate DNS traffic

MIMIC_HTTPS: WebSocket Mimicry

Use case: Maximum compatibility.

// RFC 6455 WebSocket framing
let frame = WebSocketFrame {
.fin = true,
.opcode = 0x2, // Binary
.payload = encrypted_lwf,
};
  • Works through corporate proxies
  • Domain fronting support (SNI ≠ Host)
  • ECH (Encrypted Client Hello) ready

MIMIC_QUIC: The Modern Standard

Use case: Best performance, hardest to block.

// HTTP/3 DATA frame
let h3_frame = H3Frame {
.frame_type = 0x0, // DATA
.payload = png_padded(encrypted),
};
  • UDP-based (harder to block than TCP)
  • 0-RTT connection establishment
  • Built into modern browsers

Polymorphic Noise Generator

All skins use PNG (Polymorphic Noise Generator):

// ChaCha20 + epoch-based key rotation
let encrypted = chacha20_encrypt(payload, epoch_key);
// Pad to consistent sizes (avoid timing analysis)
let padded = pad_to_size(encrypted, target: 1350);

Traffic shapes:

  • 1350 bytes (typical MTU)
  • Random intervals
  • Mimics video streaming patterns

Why This Matters

In repressive regimes, simply using encryption flags you as “interesting.” Transport Skins make you invisible in the noise.

The Kenya Rule

All of this runs on:

  • < 10MB RAM
  • Solar-powered devices
  • No cloud dependencies

If it doesn’t work in rural Kenya, it doesn’t work.


Forge burns bright.

#transport #DPI #privacy #technical