I have a small embedded system that supports FAT32. It does not have any encryption options for the files that it saves to an external USB-connected disk. Modifying the source to support encryption is not an option.
Are there any external drives, or anything that can be used to encrypt the files once they land on the disk? Something that does not require the cooperation of the embedded system?
I realize that this is a bit far fetched, but you never know!