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Encrypted loopback filesystem

Hi gurus,

I thought I would experiment with creating an encrypted loopback filesystem. I've generated a file of random numbers, but I can't attack it to /dev/loop0:

# losetup -e serpent /dev/loop0 $(pwd)/file.bin
ioctl: LOOP_SET_STATUS: Invalid argument

I did a quick google search, but what I've found refers to making sure that you have the modules and util-linux installed, and I 've got those (using Debian/Etch), and the loop and serpent modules are loaded.

What else can I check for?

Thanks for your help,


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