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Direct extension of ADR-105. Closes both items deferred from ADR-105:
(1) member-inference defence, (2) biometric primitive isolation
enforcement.
Three-layer defence:
1. PRIMITIVE ISOLATION (R15 binding) -- API-level tagging of on-device-
only tensors. Compile-time error when ✅ tagged tensors are passed
to submit_delta().
2. GRADIENT CLIPPING (Abadi 2016) -- per-sample L2 norm <= C (default
C=1.0) before delta computation.
3. GAUSSIAN NOISE (DP-SGD) -- N(0, sigma^2*C^2*I) added to aggregated
LoRA delta before transmission.
Privacy budget via Moments Accountant (delta=1e-5):
- Conservative (medical-grade): sigma=1.5, 50 rounds, epsilon=2.0
- Standard (typical RuView): sigma=1.0, 100 rounds, epsilon=5.0
- Lenient: sigma=0.5, 100 rounds, epsilon=8.0
On-device-only primitive list (R15-binding):
- Raw CSI window
- Gait stride frequency
- Breathing rate (per-subject)
- HRV rate signature
- RCS frequency response curve
- Limb timing vector
- Per-subject embedding centroid
Implementation budget: +300 LOC on top of ADR-105's 500 LOC = total
~800 LOC ruview-fed crate. 3-week effort estimate.
Composes:
- R3: Layer 1 blocks per-subject embedding centroid transmission
- R7: mincut compatible with DP-noised deltas (operates on noised graph)
- R12/R13 negative results: informed the noise-vs-structure-detection
design choice (treat adversarial deltas as outliers from noisy
distribution, not structural-detection problem)
- R14: privacy framework now has formal (epsilon, delta) backing
- R15: requirements basis = on-device-only primitive list made executable
- ADR-105: DP-SGD slots into step 4 of federation protocol
Closes the privacy story: R3 + R14 + R15 + ADR-105 + ADR-106 = complete
chain from physics (R6) -> embeddings (R3) -> personalised features (R14)
-> trained how (ADR-105) -> defended how (R7) -> privacy-bounded how
(ADR-106).
Honest scope:
- sigma values are recommendations, not measurements (per-cog tuning needed)
- (epsilon, delta)-DP is worst-case bound; auxiliary info changes practical leakage
- Moments Accountant is conservative
- Subject-level DP not formalised (household of 4 = K=4 subjects)
- Side-channel timing leaks out of scope (future ADR)
Explicitly deferred:
- ADR-107: cross-installation federation w/ secure aggregation
Coordination: ticks/tick-15.md, no PROGRESS.md edit.
3.9 KiB
3.9 KiB
Tick 15 — 2026-05-22 06:40 UTC
Thread: ADR-106 (DP-SGD + biometric primitive isolation) Verdict: Closes the two items deferred from ADR-105 (member-inference defence + primitive isolation enforcement). The federation protocol now has formally-bounded privacy.
What shipped
docs/adr/ADR-106-dp-sgd-and-primitive-isolation.md— full ADR draft. Direct extension of ADR-105.
Three-layer defence
| Layer | Mechanism | Defends against |
|---|---|---|
| 1 — Primitive Isolation | API-level tagging of on-device-only tensors (R15 binding list) | Exfiltration of biometric primitives via federation channel |
| 2 — Gradient clipping | Per-sample L2 norm bound (Abadi 2016) | Bounds sensitivity of any single training sample |
| 3 — Gaussian noise | Per-round N(0, σ²C²I) on aggregated delta | Formal (ε, δ)-DP via Moments Accountant |
Privacy budget
Recommended (per Moments Accountant, δ=1e-5):
| Profile | σ | Rounds | Total ε | Use |
|---|---|---|---|---|
| Conservative (medical-grade) | 1.5 | 50 | 2.0 | HIPAA-aligned |
| Standard (typical RuView) | 1.0 | 100 | 5.0 | Most cogs |
| Lenient | 0.5 | 100 | 8.0 | Below ε=10 community soft-bound |
On-device-only primitive list (R15-binding)
7 ✅ "never transmit" primitives:
- Raw CSI window
- Gait stride frequency
- Breathing rate (per-subject)
- HRV rate signature
- RCS frequency response curve
- Limb timing vector
- Per-subject embedding centroid
3 ⚠️ "transmit with mitigation":
- MERIDIAN per-room centroid (aggregate, OK)
- LoRA weight delta (DP-SGD applied)
- Model logits during inference (never aggregated)
API surface enforces ✅ as compile-time error where possible.
Implementation budget
Extends ADR-105's 500 LOC by +300 LOC: PrimitiveTag (60) + clipping (30) + DP noise (40) + Moments Accountant (120) + per-cog config schema (50). Total federation budget: ~800 LOC, 3-week effort.
Why this closes the privacy story
R3 + R14 + R15 + ADR-105 + ADR-106 = complete chain from physics (R6 forward model) → embeddings (R3) → personalised features (R14) → trained how (ADR-105) → defended how (R7) → privacy-bounded how (ADR-106).
The chain has:
- A physics floor (R6/R1)
- A spatial intelligence layer (R5/R7/R3)
- A vertical roadmap (R10 wildlife + R11 maritime + R14 home)
- Two negative results (R12 eigenshift, R13 contactless BP)
- Two architectural decisions (ADR-105 + ADR-106)
The per-occupant feature surface (R14 V1/V2/V3) now has formal (ε, δ) privacy backing, not just policy.
Composes with every prior thread
- R3: Layer 1 blocks per-subject embedding centroid transmission
- R7 mincut: compatible with DP-noised deltas; operates on noised graph
- R12/R13 negative results: informed the noise-vs-structure-detection design choice
- R14: privacy framework now has formal (ε, δ) backing
- R15: requirements basis = on-device-only primitive list made executable
- ADR-105: 800 LOC budget, DP slots into step 4 of protocol
Honest scope
- σ values are recommendations, not measurements (per-cog tuning needed)
- (ε, δ)-DP is worst-case bound; auxiliary info changes the practical leakage
- Moments Accountant is conservative (slightly over-estimates budget consumed)
- Subject-level DP not formalised (household of 4 has K=4 subjects → sample-level DP doesn't fully capture)
- Side-channel timing leaks out of scope (future ADR)
Coordination
ticks/tick-15.md. No PROGRESS.md edit. Branch research/sota-adr106-dp-sgd-primitive-isolation.
Remaining loop work (post ADR-106)
- R6.1 multi-scatterer Fresnel extension
- R3 follow-up: physics-informed env_sig prediction (zero-shot cross-room)
- R6.2 Fresnel-aware antenna placement CLI tool
- ADR-107: cross-installation federation w/ secure aggregation (explicitly deferred from ADR-106)
- Loop retrospective / 00-summary.md (premature — ~5h still on clock)
~5.3h to cron stop. 15 ticks landed. PROGRESS.md research agenda + 1 follow-up ADR closed.