Redmine

It would be useful to be able to ecnrypt passwords or other secret string in a wiki site, e.g. a server administration howto also documenting the login credentials. I think ia already saw this feature in media wiki, where secret stuff then is shown users without needed rights as *. When Logged in with needed rights to see "encrypted" strings, the are repalced with the secret.
It is important not to have the whole site encrypted, but the patz in between a <secret>.. </secret> Tag.