Mac in the shop -- how to access encrypted FS image on USB key?

My Mac is in the repair shop (it's a G4 PowerBook, circa Titanium). In the meantime, I've got a USB key with a UFS file system created by 10.3.9, on which resides an AES-128-encrypted disk image (.dmg file).
I can mount the USB key's UFS file system from Linux, using 'mount -t ufs -o ro,ufstype=openstep /dev/sdb3 /mnt/<whatever>', so I can see the encrypted disk image (as well as my non-encrypted files). I believe I know the password for the encrypted disk image. But what file system type is it? Is it also ufs/openstep?
The basic question is, when creating an AES-128 encrypted disk image using Disk Utility, what is the file system type underneath the encryption?
Thanks!

Hm. Well, when I use Disk Utility on 10.3.9 to create an encrypted disk image, it doesn't give me any choice as to the file system format. It allows me to choose what directory to create it in, how big it should be, and whether or not to use AES128 encryption -- that's it. Maybe there are more choices on Tiger/Leopard.
So, what file system type will Disk Utility on 10.3.9 create?

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Mac in the shop -- how to access encrypted FS image on USB key?

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