I am not a cryptographer. At a quick inspection this kind of thing would result in pretty bad encryption. A hash of each word (unless salted with a different s

I am not a cryptographer. At a quick inspection this kind of thing would result in pretty bad encryption. A hash of each word (unless salted with a different salt each time, defeating the purpose) is easily broken, even if the hash is a cryptographic hash. I.e. I can build up a dictionary by hashing the top 100k most common words. This kind of attack is why every encryption needs some randomness (or something that's changing) injected to it. It's also unprotected against replay attacks, etc. And I'm probably just scratching the surface. You really have to encrypt full messages. And sending the same message twice has to result in different ciphertexts. And you need nonces. And probably many other things. Cryptography is hard.