Yeah - I would imagine with some hash functions it doesn't make much difference whether you have access to message0, or just the hash of message0. Whereas with

Yeah - I would imagine with some hash functions it doesn't make much difference whether you have access to message0, or just the hash of message0. Whereas with other hash functions it might make a lot of difference. It's never going to be better to only have the hash vs having the message itself though.