Blog

A plain-English walkthrough of Shamir's Secret Sharing, the polynomial trick, where it works in production, and the brutal failure modes that make it the wrong tool for most family inheritance plans.

The threat model, the wrapped master key architecture, the per-file content keys, the per-share keys, and the trigger pipeline, a transparent walkthrough of KinSwitch's original zero-knowledge design, preserved as history. We retired this architecture in 2026.