dm-crypt on Linux kernel 2.6.x, when used on certain file systems with a block size 1024 or greater, has certain "IV computation" weaknesses that allow watermarked files to be detected without decryption.Referenceshttp://mareichelt.de/pub/notmine/diskenc.pdfhttp://www.securiteam.com/exploits/5UP0P1PFPM.htmlhttp://marc.info/?l=linux-kernel&m=107719798631935&w=2
