I want to have an encrypted doc so only i can read it. I was thinking it should be many pages broken up and have a dif so i can go back a version or see the changes. I dont want my host to see the data, nor anyone using packet sniffing (thus i'll use SSL). Is there any wiki software that supports this?

Could you install the wiki server on your local machine? Or does it have to be on the public internet?

Not that I know of, but there is a Firefox plugin that can GPG encrypt and decrypt website content. I.e. it encrypts your form data before submitting and can detect GPG encrypted data on a page and decrypt it. In theory you could use this in combination with any wiki out there, but there will be some downsides.

- The wiki never sees the contents so can't do anything with it. No links, markup or anything. All it can do is render a plain text block.
- No usable diffs, but full revisions should work.

Combine this with SSL and you should be set.

[edit] Oops, I didn't realize you don't want your webhost to see the data, either. I think you might be out of luck.