I don't know if this is what you are looking for, but Truecrypt.org is a 
good encryption program. 

relw@mchsi.com wrote:
> Has anyone on this distribution configured an open source encryption
> tool that will encrypt both Windows and Linux partitions?  My workplace
> is mandating that all our laptops be encrypted and their chosen tool
> only supports Windows (no big surprise there)...
>
> I have gotten some recommendations on OS tools that can do this, but
> haven't yet found anyone with a working config that ideally permits
> Linux to read the encrypted Windows partitions.
>
> TIA,
>
> Richard Wilson
>
> If/when I get this working would there be interest in sharing the
> configuration information?
>
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