The original title is "How Zero-Knowledge Encryption Actually Works (with the Web Crypto API)"

Short summary

A technical deep dive into implementing true zero-knowledge encryption using only the browser's native Web Crypto API. Covers PBKDF2 key derivation with 100k iterations, AES-256-GCM authenticated encryption with fresh IVs, and why the server should never receive plaintext or keys. Includes working code examples and a practical audit checklist for verifying zero-knowledge claims.

• •Zero-knowledge means the server mathematically cannot read data, not just a policy promise
• •PBKDF2 with 100k iterations stretches passwords into AES-256-GCM keys; only salt, IV, and ciphertext leave the browser
• •Audit client-side crypto in dev tools — if plaintext or keys touch the server, it isn't zero-knowledge

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