Wouldn't aplying an offset to losetup significanly increase the dificulty of finding the location of
the encrypted "plain" text of which to launch the dictionary attack?
>On popular file systems
>such as ext2, ext3, reiserfs and not so popular minix, first 16 bytes of
>fourth 512 byte sector is such good known plaintext. Byte offset 0x600 to
>0x60F of plaintext contain all zero bits. File system itself does not use
>that data at all, but mkfs for file system in question puts that known
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