I'm looking for file encryption software that will work across different platforms. I use Windows (both 2K and XP) and Linux (ass't flavors, Ubuntu right now primarily). All I need is a basic app to encrypt a few sensitive files I'd keep on a thumbdrive.

I played with ccrypt a while back and it seemed ok. I'm thinking PGP and GnuPG are a bit of overkill, but it might behoove me to start picking up on these pkg's.

Any suggestions?