how can I be sure that my data is encrypted ?

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I did the following

# echo 0 `blockdev --getsize /dev/sda6` crypt aes-plain
0123456789abcdef0123456789abcdef 0 /dev/sda6 0 | dmsetup create volume0

# mkfs.reiserfs /dev/mapper/volume0
# mount /dev/mapper/volume0 /mnt
# mount |grep volume0
/dev/mapper/volume0 on /mnt type reiserfs (rw)

Now how can I verify that its(encryption) working fine or not ? 

I unmount and mount the /dev/mapper/volume0 several times, but it never
ask me to provide the cipher. 

How can I be sure that my data is safe ?

-- 
Regards,

Muhammad Sharfuddin




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