LUKS master key generation and keyfiles

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hi folks, hi clemens,

reading
http://www.linux-magazine.com/issue/61/Hard_Disk_Encryption_DM-Crypt_LUKS_cryptsetup.pdf
(especially figure 2) and
http://luks.endorphin.org/LUKS-on-disk-format.pdf
i did not really find out how the master key is generated, when a keyfile is 
used a'la 'cryptsetup luksFormat blockdev keyfile'.

is the initial keyfile the master key or is it used to derive the master key 
or is - as i hope - the master key always a random number?

thanx & ciao p.

p.s.: excellent job, LUKS...

-- 
Peter Palensky
Vienna University of Technology
Institute of Computer Technology
http://www.ict.tuwien.ac.at

5th IEEE Conference on Industrial Informatics!
http://www.indin2007.org

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