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Johnathan Corgan
ce6dba9225
Documents the tradeoff between metadata privacy and route error feedback: - Intermediate routers see src_addr/dest_addr (traffic analysis possible) - Source address needed for CoordsRequired/PathBroken error messages - Deliberate choice: explicit feedback over silent drops + app timeouts - Partial mitigation: addresses are SHA-256(npub), not npubs themselves - Notes onion routing as alternative with different tradeoffs
FIPS Design Documents
Protocol design specifications and analysis for the Federated Interoperable Peering System.
Suggested Reading Order
Start with the high-level architecture, then work through session flow, routing concepts, and finally the wire-level protocol details.
1. Introduction and Overview
| Document | Description |
|---|---|
| fips-intro.md | Protocol introduction: goals, concepts, architecture |
2. Protocol Flow (How Traffic Works)
| Document | Description |
|---|---|
| fips-session-protocol.md | End-to-end session flow, Noise IK encryption, terminology |
3. Routing (How Packets Find Their Way)
| Document | Description |
|---|---|
| fips-routing.md | Routing concepts: bloom filters, discovery, greedy routing |
| spanning-tree-dynamics.md | Tree protocol behavior: convergence, partitions, recovery |
| fips-gossip-protocol.md | Wire formats: TreeAnnounce, FilterAnnounce, Lookup messages |
4. Link Layer (How Peer Connections Work)
| Document | Description |
|---|---|
| fips-wire-protocol.md | Transport layer: Noise IK, session indices, roaming, security |
| fips-transports.md | Transport-specific: UDP, Ethernet, Tor, radio characteristics |
Implementation
| Document | Description |
|---|---|
| fips-architecture.md | Software architecture: entities, state machines, configuration |
| fips-tun-driver.md | TUN interface driver: reader/writer threads, ICMPv6, packet flow |
| fips-state-machines.md | Phase-based state machine pattern: peer lifecycle, transitions |
Document Cross-References
fips-intro.md
│
┌────────────┴────────────┐
▼ ▼
fips-session-protocol.md fips-architecture.md
│ │
┌─────────┴─────────┐ ▼
▼ ▼ fips-transports.md
fips-routing.md fips-wire-protocol.md
│ │
▼ ▼
spanning-tree-dynamics.md ←→ fips-gossip-protocol.md