I have a number of machines sharing data over a NAS. Systems include Windows 7, Ubuntu, Xubuntu and Mint. Now that Truecrypt has been discontinued, supposedly because it can be cracked, is there any way to encrypt a small area of the NAS to share confidential data accros all platforms. Ideally it would be multi-user, so different machines can access it at the same time. When I used to use Truecrypt this was a shortcoming I would like to overcome with a better system.