The "as much of an art project, as an applied cryptography exercise" take resonates a lot!

Just earlier this week I've released https://github.com/kirushik/paternoster (and even won Berlin Hack and Tell with it) — and it totally came from the idea "in that state-enforced Max messenger there so much surveillance you can only praise the authorities and pray in there. What if there was a way to hide messages into the text of Church Slavonic prayers?"

I've even added TTS (where supported) to it, just for the giggles of getting the "TRUMP" dictionary thorough it.

It's still a pretty solid X25519+AES-GCM encrypted messaging design under the hood, and I'm happy with it — but it still a bit of an afterthough tbh...