TrueLock – encrypted capsules with built-in unlock rules

by dkatsura • 5 months ago

1 5 5 months ago

dkatsura5• 5 months ago

I built TrueLock to share content that opens only under rules, without cloud dependency or a central service.

A capsule is one .cfcaps file containing encrypted payload + an embedded unlock policy. The recipient gets one file, and the app checks rules locally before open.

Current rules:

time window

geo radius

password

visual key (up to 5 images)

AND/OR logic across rules

Windows geo can be confirmed via a phone relay (QR challenge/proof flow).

Capsules can contain text and attachments (including media). Current clients: Android + Windows.

Crypto in current build: AEAD (AES-GCM / ChaCha20-Poly1305) + Argon2id for passwords. Format: cross-platform capsule container.

Threat-model boundary: This is application-layer enforcement. A fully compromised endpoint/runtime can bypass local checks or exfiltrate plaintext after legitimate open. The goal is programmable disclosure in normal environments (reduce premature/accidental access).

I’d value technical feedback on:

threat-model clarity

most compelling real use case

which trust artifact is most useful next (format spec, vectors, reproducible builds, etc.)

Quick test: set a time window (e.g., unlock in 2 minutes), share the .cfcaps, try open before/after.

https://truelock.pro

dkatsura5• 5 months ago

Maker here. I’m especially interested in criticism of the threat model.

If you try it, I’d love feedback on:

which rule is actually useful in practice (time/geo/visual key)

what is confusing in setup

what would increase trust fastest (spec, vectors, reproducible builds)

dkatsura5• 5 months ago

If useful, I can post a minimal capsule format sketch (header + policy fields) and a compact threat-model table (what it protects vs. what it does not).

TrueLock – encrypted capsules with built-in unlock rules

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