Method 2: download and compile cryptsetup device-mappercrypto (have a skip) wgethttp://www.saout.de/misc/dm-crypt/cryptsetup-0.1.tar.bz2 cdcryptsetup-0.1./configure; make; makeinstall compile kernel (already supports skip this step) makemenucong DeviceDrivers > Multi-devicesupport (RAIDandLVM) CONFIG_BLK_DEV_DM CONFIG_DM_CRYPT loaded module modprobedm-crypt (and encryption module) to create a loop device ddif =/dev/zeroof = ~/dm-crypt.imagebs = 1Mcount = 10/dev/loop0 losetup ~/dm-crypt.image establish device-mapper cryptsetup-ycreatedm-crypt/dev/loop0 (prompting for a password) to create a file system and load the mkfs.ext3/dev/mapper/dm-crypt mount/dev/mapper/dm-crypt/mnt/umount/mnt crypto offload/crypto/cryptsetupremovedm-crypt losetup-d/dev/loop0 reloads cryptsetup-ycreatedm-crypt/dev/loop0 mount/dev/mapper/dm-crypt/mnt/crypto device-mappercrypto implementation in the drivers/md directory, relatively much more complex, there is no time to read it carefully.
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