FOSS cross-platform data drive encryption

[Adam Dershowitz]

On Mar 23, 2012, at 11:03 AM, Sam Kuper wrote:

> Forgive the cross-posting. I've already asked this question on
> superuser.com, but I figure that the sets of MacPorts-Users mailing
> list subscribers and superuser.com users might not overlap very far.
> The question is:
> 
> Is there any dependable FOSS that provides hard disk encryption such
> that a data drive (i.e. not a system drive) can be moved between
> Linux, OS X and Windows systems, and can be read from and written to
> on each of those platforms?
> 
> To tailor the question for this list, let me edit that as follows:
> "... any dependable FOSS *available via MacPorts*..." :)
> 
> Many thanks,
> 

Will truecrypt (http://www.truecrypt.org/)  do what you need?  

--Adam