I would like every node created to have a unique ID. What's the best way to go about this? I know of the UUID module, but I don't really want the IDs to be formatted like a UUID. Does there exist a module that creates a unique ID that looks like (for example) an md5 hash?
The reason for doing this is that information about certain nodes has to be passed around between a few servers (in emails in some cases) and I don't wan't people to be able to have access to the drupal server's systems, I'd rather them see something like a hash as opposed to drupal's nid.