SumLock · concept preview
SumLock replaces your PIN with a secret total only you know. Every wake shows a fresh sum — the answer you tap is never the same twice, so watching your fingers tells a thief nothing.
→ demo secret is 15. If it shows 7 + ▢, tap 8. If it shows 18 − ▢, tap 3.
18 − ▢.18 − 3 = 15 — tap 3. Next time it asks something else.one secret, four disguises
Pick a level, or tune every rule — the phone above re-locks with your changes.
Your duress code and private area aren’t separate passwords — they’re small offsets on the same answer. Nobody watching can tell which one you used.
The phone unlocks. 7 + ▢ → tap 8.
Tap 9 instead. The screen unlocks identically — but a silent alarm is logged. Someone forcing you to unlock sees nothing unusual.
Tap 11. Your private area opens — hidden notes, photos, apps. To everyone else it never existed.
try all three in the demo above ↑
| What an attacker tries | 4-digit PIN | SumLock |
|---|---|---|
| Smudge trail on the glass | Reveals the PIN outright | Smudges spread across every key |
| Watching your fingers (screen not visible) | One glance and it’s stolen | Taps are uniform random — zero information |
| A glance at screen and hands | Stolen | Must capture both, then out-calculate you on the spot |
| Clean video of screen + hands | Stolen | Stolen too — no deterministic lock survives this. That’s why the system PIN stays behind SumLock as the real credential. |
| Blind guessing | 1 in 10,000, throttled | 1 in 9 per try — throttled hard (30 s, 60 s, …), then the system keyguard takes over |
the honest row is the fourth one — we’d rather you trust the other three
A lock that resists the two most common real-world attacks — smudges and finger-watching — with a duress code and a hidden area built into the same gesture.
Set the grade range and every unlock becomes a maths rep. A planned quiz mode shows both numbers — no secret, pure practice — so the phone quizzes the kid before it opens.