Encrypted Volumes for Linux and Windows?

share_it asks: "On my Win PC I used a lot of encryption: I had encrypted small files for personal stuff, encrypted virtual disks for programs, music, video, etc. I used PGPdisk and mounted 3 big virtual disks (for a total of 170 gigs) on startup with just one single passphrase and those 'disks' were even quite fast. I have now switched to GNU-Linux for most of my interests, but sometimes I have to use Windows and I want my data to be encrypted and accessible from both OSes The only software that I found which can mount the same encrypted disk on both platforms is BestCript, but from Linux I can't store file with long names. Is there a better way to share encrypted data between when I dual-boot?"