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rUv 40e5a4d6f2
adr-108: Kyber post-quantum key exchange for cross-installation federation (#731) 
Closes the quantum-resistance gap explicitly deferred from ADR-107.
Final ADR in the privacy + federation chain.

Replaces DH key exchange in ADR-107's Layer 4 secure aggregation with
Kyber-768 KEM (NIST FIPS 203, CNSA 2.0 default).

Migration timeline:
- Phase 0 (NOW 2026): Classical X25519 (ADR-107 default)
- Phase 1 (2026-Q4 -> 2027): Kyber-768 opt-in via --enable-pqc flag
- Phase 2 (2027-Q2 -> 2028): Hybrid (X25519 + Kyber-768) becomes default
- Phase 3 (2030+): Pure Kyber-768 (classical retired)

Why hybrid for Phase 2 (belt-and-braces):
- Protects against future Kyber breaks (Kyber is ~5 years old)
- Protects against classical breaks (X25519 backup)
- Protects against implementation bugs in either primitive
- Cost: ~3 kB/round/installation extra (negligible)

Why now (record-now-decrypt-later):
Adversaries can record federated updates today and decrypt them in
2035 when quantum capabilities arrive. Without ADR-108, the (epsilon,
delta) guarantees of ADR-106 silently expire when quantum computers
arrive. Proactive migration is cheap insurance.

Why Kyber-768 (not 512 or 1024):
- NIST FIPS 203 (2024); ~AES-192 equivalent
- CNSA 2.0 recommended default
- Used by Cloudflare, Google, AWS in 2024-2026 rollouts
- Public key 1184 B, ciphertext 1088 B, secret 32 B
- 512 lacks CNSA 2.0 sign-off; 1024 doubles bandwidth without benefit

LOC: +220 on top of ADR-107.
Total federation budget ADR-105+106+107+108: ~1,550 LOC.

Threat model: 8 threats, every row has mitigation. Hybrid mode is
the belt-and-braces against both Kyber breaks AND classical breaks.

ADR CHAIN COMPLETE: 7 ADRs in the privacy + federation chain:
ADR-100 (cog packaging) -> ADR-103 (cog example) -> ADR-104 (MCP/CLI)
-> ADR-105 (within-installation federation) -> ADR-106 (DP + isolation)
-> ADR-107 (cross-installation + SA) -> ADR-108 (PQC key exchange).

No remaining unspecified privacy gap at any threat horizon (classical
or quantum).

Future ADRs catalogued:
- ADR-109: PQC signatures (Dilithium replaces Ed25519 in ADR-100)
- ADR-110: PQC hardware acceleration on Cognitum-v0
- ADR-111: PQC for cog-store distribution

Composes:
- R3 / R14 / R15 / R7 / R12 PABS: privacy chain intact through quantum transition
- R10 / R11 (long-deployment): benefit most from forward secrecy as data ages

Honest scope:
- Kyber ~5 years old; hybrid mitigates uncertainty
- 'When do we need this?' uncertain (2030 aggressive / 2050+ conservative)
- ESP32-S3 timing ~10 ms per handshake estimated negligible; needs measurement
- Phase 3 retirement of classical needs future decision

Coordination: ticks/tick-28.md, no PROGRESS.md edit.
 		2026-05-22 05:45:32 -04:00
..
ticks adr-108: Kyber post-quantum key exchange for cross-installation federation (#731) 2026-05-22 05:45:32 -04:00
HORIZON.md docs(horizon): M3-M7 complete — close 12h autonomous SOTA run 2026-05-22 00:06:40 -04:00
PROGRESS.md feat(tools/ruview-mcp): M2 — wire real inference via cog health (#706) 2026-05-21 23:43:32 -04:00
R1-toa-crlb.md research(R1): ToA CRLB — precision floor for WiFi multistatic localisation (#711) 2026-05-22 01:38:35 -04:00
R3-crossroom-reid.md research(R3): cross-room re-ID — MERIDIAN closes the env-shift gap + 4 privacy constraints (#715) 2026-05-22 02:13:10 -04:00
R3_1-physics-informed-env-prediction.md research(R3.1): physics-informed env prediction at raw-CSI level — NEGATIVE (architecture-error) (#723) 2026-05-22 04:04:38 -04:00
R3_2-embedding-level-physics-env.md research(R3.2): embedding-level physics-informed env — structural validation + AETHER dependency (#729) 2026-05-22 05:24:53 -04:00
R5-subcarrier-saliency.md research(sota): kick off SOTA research loop + first R5 saliency measurement (#702) 2026-05-21 23:05:55 -04:00
R6-fresnel-forward-model.md research(R6): Fresnel-zone forward model — bedrock physics for CSI sensitivity (#710) 2026-05-22 01:31:09 -04:00
R6_1-multiscatterer-forward-model.md research(R6.1): multi-scatterer Fresnel — discovers 4.7 dB penalty matching R13's 5-dB shortfall (#721) 2026-05-22 03:36:42 -04:00
R6_2-fresnel-antenna-placement.md research(R6.2): Fresnel-aware antenna placement — 93x sensing-coverage lift from physics alone (#719) 2026-05-22 03:04:17 -04:00
R6_2_1-3d-placement.md research(R6.2.1): 3D antenna placement — ceiling-only gives 0% coverage; mixed-height wins (#724) 2026-05-22 04:17:47 -04:00
R6_2_2-multistatic-placement.md research(R6.2.2): N-anchor multistatic placement saturation — practical knee at N=5 (#720) 2026-05-22 03:17:14 -04:00
R6_2_2_1-3d-multistatic.md research(R6.2.2.1): 3D N-anchor multistatic — 2D knee disappears; revises R6.2.2 down (#727) 2026-05-22 04:58:10 -04:00
R6_2_3-chest-centric-placement.md research(R6.2.3): chest-centric placement — +26.9 pp coverage gain for vital-signs cogs (#726) 2026-05-22 04:43:34 -04:00
R6_2_4-3d-chest-multistatic.md research(R6.2.4): 3D chest-centric N-anchor — validates R6.2.2.1 prediction with refinement (#728) 2026-05-22 05:12:48 -04:00
R6_2_5-multi-subject-union.md research(R6.2.5): multi-subject occupancy union — N=5 hits 100% for 4 occupants; R6 family complete (#730) 2026-05-22 05:37:29 -04:00
R7-multilink-consistency.md research(R7): Stoer-Wagner mincut detects adversarial CSI nodes 3/3 in synthetic (#704) 2026-05-21 23:28:46 -04:00
R8-rssi-only-count.md research(R8): RSSI-only person count retains 95% of full-CSI accuracy (#703) 2026-05-21 23:18:09 -04:00
R9-rssi-fingerprint-knn.md feat(tools/ruview-mcp): M2 — wire real inference via cog health (#706) 2026-05-21 23:43:32 -04:00
R10-through-foliage-wildlife.md research(R10): through-foliage wildlife sensing — physics feasibility + per-species gait taxonomy 2026-05-22 00:59:11 -04:00
R11-maritime-sensing.md research(R11): maritime sensing — through-bulkhead impossible, through-seam works (#712) 2026-05-22 01:53:51 -04:00
R12-pabs-implementation.md research(R12 PABS): NEGATIVE -> POSITIVE — 1161x detection lift via R6.1 forward model (#722) 2026-05-22 03:49:41 -04:00
R12-rf-weather-mapping.md research(R12): RF weather mapping eigenshift — negative-ish, with clearly-actionable revision path (#707) 2026-05-21 23:52:49 -04:00
R13-contactless-bp-negative.md research(R13): NEGATIVE — contactless BP from CSI is physically inferior to a cuff (#713) 2026-05-22 02:00:35 -04:00
R14-empathic-appliances.md research(R14): empathic appliances — vision + ethical framework + infrastructure gap inventory (#709) 2026-05-22 01:18:01 -04:00
R15-rf-biometric-primitives.md research(R15): RF biometric primitives — 5 environment-invariant features with quantified discriminability (#717) 2026-05-22 02:38:10 -04:00