I wish someone would create an encrypted-messaging-over-SMS protocol. Something simple: send a public key with the first (unencrypted) SMS and the receiving per

I wish someone would create an encrypted-messaging-over-SMS protocol. Something simple: send a public key with the first (unencrypted) SMS and the receiving person's messaging app can use that key to reply with an encrypted SMS, first reply also containing his/her public key. No forward secrecy, but a lot better than nothing.