Monthly Archives: August 2011

Add additional loop device on Linux

  • mknod created a new device.
  • -m660 sets the mode to 660 for the filesystem.
  • /dev/loop8 specifies the device to create.
  • b sets the device as a block device.
  • 7 and 8 are major and minor device numbers.

So this creates on a standard Linux the eighth loopback device.

mknod -m660 /dev/loop8 b 7 8
chown root.disk /dev/loop8
chmod 666 /dev/loop8


Mount an encrypted file as loopback device (linux)

  1. Make sure you have the required modules in the kernel. Use ‘modprobe cryptoloop’ and ‘modprobe aes’.
  2. Create empty 100MB file imageĀ  named MyImage.img with ‘dd if=/dev/urandom of=MyImage.img bs=1M count=100’. Be warned, this my take some minutes.
  3. ‘losetup -e aes /dev/loop0 MyImage.img’ connects your image to loop0.
  4. You have to enter your new password now.
  5. With ‘mkfs -t ext2 /dev/loop0’ formats your new ‘drive’.
  6. ‘mount /dev/loop0’ and
  7. ‘mount -o loop,encryption=aes MyImage.img /mysafe’ mount your new document safe to /mysafe. You might need to create /mysafe before that.
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