[stop_nazi]

The problem with the horrible injections on the page can be solved very simply. If the information on a page is open, just pass that page openly and pass a checksum of page in the header. To prevent this sum from being tampered with, the server will encrypt it. Not the whole page, just the sum. You will save a lot of CPU time on server and on client, reduce CO₂ and so on

[Avamander]

So TLS with some "eNULL" ciphersuite. People have been there, tried that. There's very very little practical value in that over just doing proper encryption as well.

[Ferret7446]

You aren't really saving anything. Hashing and encryption are very similar, so hashing the entire page is comparable to just encrypting it.