Does Foswiki have encrypted groups or any other technique to restrict access all the way?
The kind of dogsbody who administers an enterprise's computers is unlikely to be party to all its secrets, much less those of its business partners. Does Foswiki have encrypted groups or any other technique to restrict access all the way?
Not at this time. The default Foswiki database uses text files, and there is no way to stop a privileged dogsbody from accessing these files. There has been some work towards providing support for encrypted topics using plugins, but this work is not included in core Foswiki.
This was a conscious decision. Wikis are intended to be open environments for collaboration, and TWiki (from which Foswiki grew) was designed to be easy to administer. Adding too many security features into the core works against this goal, as users are siloed into smaller and smaller groups. This reduces wikiness, thus tending to neutralise the advantages that Foswiki has over more conventional CMSes.