using encryption with FC2

[pouet pouet]

>
>Did you google?
>

of course I did ;-)
and I found something like this mini how-to U wrote (thanks a lot!)
What I wanted to say is that there is no official how-to in my FC2 distrib

ok for the dd, losetup, mkfs and mount the encrypted file on the mount point
it is working fine !

> > How-to choose key length ?
Sorry I was not clear
I mean : crypto api seems to ask for the key lengh 128, 256... when losetup 
the file
here with losetup, nothing is asked except a password.
The question is : can we choose the key lengh or/and what is the default key 
lengh ?

>
> > How-to use encrypt and mount a partition (not filesystem) ?

I mean, is it possible to encrypt a device, a whole slice or disk. For 
exemple I want /dev/hdb to be mounted "on demand" onto /encrypted using aes 
256bits ? I hope it was possible using LVM or something else...

Anyway thanks for the mini-howto. I'm sure it will be very usefull for a 
lots !

Question for fun : is this method to protect data really strong ?
I mean, i know it depends on the crypto module that is used but for example 
with two-fish or aes, is it really hard (or quite possible/impossible) to 
decode data once dismonted ???

Thanks for your help

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