HChat is a WhatsApp web client that adds an additional end-to-end encryption layer on top of WhatsApp itself with ephemeral X25519 key agreement and AES-256-GCM encryption before messages ever hit the wire, optionally routing through Tor. it matters because it provides a defense-in-depth approach against client-side scanning and surveillance regimes like Chat Control by ensuring content is encrypted before it reaches any platform infrastructure. Credit for building practical resistance tools.

https://github.com/dani69654/hchat