Founder of XTrace here. Happy to share how we built the homomorphic encryption to make semantic search on ciphertext fast enough to be practical, and to go deeper on the cryptography and security model if useful.

I was thinking about this as well especially when all the AI tools we're using are keeping our conversations and data. Not sure if this solution can solve it though, since all that data will still go through them even if i can encrypt it in XTrace. thoughts? Will give it a try!