I used to do something like this before Signal became a thing. We used to use OTR via the Pidgin OTR plugin to send encrypted messages over Google Hangouts.
It was pretty funny to check the official Hangouts web client and see nonsensical text being sent.
oldfart@lemm.ee 1 year ago
We went full circle to the early 2000s, slapping PGP on top of public messaging platforms!