Subwikis with their own User-Groups?

Hi everyone,

I’ll have to use LDAP-Authentication with my Wiki. There are two groups which will use the wiki. The question is: Can I create two subwikis with their own LDAP-configuration so that a user can only see his group-space? Or is a space not the same as a Subwiki? I’m still fairly new to the world of wikis so please forgive me If my question seems kind of stupid.

Group A → Subwiki A
Group B → Subwiki B

Or would I need two separate instances for that?

Than you very much.