using encryption with FC2

[pouet pouet]

I wonder how to use encryption with FC2.
crypto-api seems to be included and it is possible to mount a loop device 
with an encryption filter with (losetup -e )but there is no real how-to.
How-to choose key length ?
What kind of algoryhtm is available ...
How-to use encrypt and mount a partition ???

need help

thx by advance
AF

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