Have you looked at truecrypt? http://www.truecrypt.org/

There's even a portable mode (with caveats) 
http://www.truecrypt.org/docs/?s=truecrypt-portable


On Mar 5, 12:14 am, Steve Rutter <[email protected]> wrote:
> The problem is that none of those solutions are portable. And the portable
> solutions require me to have to manually encrypt the file and copy over the
> file in my dropbox. The problem with this is that, inevitably, I have to
> unencrypt the file to disk, and then have FF open it. What would be nice is
> to have a FF extension that could see an encrypted file, discern the
> encryption scheme from from a line of xml and then ask for the password to
> decrypt before displaying it.
>
> I know how to keep my data safe in DB, but nearly all of those use admin
> rights. I want to use the same wiki at work, where I don't have those
> rights, and cannot have support install them. While I'm not entirely
> concerned with touching my workstation disk, I don't want to accidentally
> forget to re-encrypt and upload the new file.
>
>
>
>
>
>
>
> On Sun, Mar 4, 2012 at 9:56 PM, PMario <[email protected]> wrote:
> > I'd use a system like described here.
> > Makes it possible to use any type of encrypted files with Linux, Mac
> > an Win systems.
>
> >http://www.webupd8.org/2011/06/encrypt-your-private-dropbox-data-with...
>
> > On Mar 4, 7:45 pm, bluespire <[email protected]> wrote:
> > >... This, if you ask me, should be even easier that
> > > individual tiddlers.
> > Yes it is.
>
> > > ... but I'm not even interested at this
> > > point in THAT much security.
> > I'm pretty sure, you need to take care of the browsers cach. Otherwise
> > I don't see any reason, to encrypt the stuff at all. If you just don't
> > want to send plain text to Dropbox I'd have a look at the link above.
>
> > -m
>
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