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cryptsetup can't destroy last key of a LUKS partition under Ubuntu/Debian

Hello everyone,

I noticed last week that the Debian packaged version of cryptsetup has a
little limitation, which could be a security issue for people who have to
destroy their data forever. 

It is impossible to destroy a keyslot when you used it to unlock the master

I reported the bug to debian (etch and lenny are affected as far as I tested):
and to ubuntu (tested on hardy):

It's not a major security problem, but people who were planning to run 
'cryptsetup luksDelKey /dev/sda1 0' on their installation when the police 
comes to wake them up should be adviced that it won't work out of the box.


Pierre Dinh-van

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