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 Since kernel 2.6.4, encrypted filesystem support is provided by the device mapper target dm-crypt. This utility provides a command-line interface for configuring this facility. It has integrated support for LUKS. cryptsetup is backwards compatible with the on-disk format of cryptoloop, but also supports more secure formats. This package also includes support for automatically configuring encrypted devices at boot time via the config file /etc/crypttab. When combined with newer versions of the debian initrd-tools and standard debian kernels, cryptoroot is also supported.