Date: 06/22/05 (Software)    Keywords: php, mysql, sql, security, web, linux, yahoo

I have a group of users (100 or so) that need read/write access to a document (excel) of sensitive information. Since they are all over the place, they requested a web application to be able to access from anywhere whenever they need to modify or look at this document. I'm trying to figure out what is the best way to provide a secure way to only allow these specific users to access this document.
ideas have included:

Plone - complex, looking for simplicity
phpBB - requires me to set up a mysql linux box somewhere which might be possible
Yahoo groups - not very secure but basically what i want

any other ideas? Security of this information is the biggest priority. i currently have both linux/windows available to host.

Source: http://www.livejournal.com/community/software/54525.html