Loop mounting an encrypted luks full disk image
Open:
fdisk -l -u imagename.img
kpartx -a -v imagename.img
cryptsetup luksOpen /dev/mapper/loop0pN LUKSNAME
vgscan
vgchange -a y VGNAME
mount /dev/mapper/VGNAME-LVNAME MOUNTPOINT
Close:
umount MOUNTPOINT
vgchange -a n VGNAME
cryptsetup luksClose LUKSNAME
dmsetup info
dmsetup remove /dev/mapper/loop0p1
dmsetup remove /dev/mapper/loop0pN…
losetup -a
losetup -d /dev/loop0
source: http://www.blaicher.com/2013/01/accessing-an-encrypted-full-disc-image-lukslvm/