Possible Duplicate:Which Content Management System (CMS) should I use? I'm looking for a secure wiki technology that will allow shared note taking and documentation. Security, organization, and revision control are critical. Any advice will be appreciated! 
Secure enterprise wiki technology?
tools;recommendations;wiki
Any wiki that has logins, a database that can be encrypted, and runs on SSL should provide enough security for you. You will also need to take security measures as you would with any system - physical access to PCs and the server, making sure that you can trust your users etc. You can ask specific questions on http://security.stackexchange.com.Every wiki I've seen has revision control. As for organisation, you probably need to be more specific.