Partition Help

bigbooty · 11-30-2010, 09:57 AM

So after creating the partitions needed: /dev/sda1 and /dev/sda2.
This is all under fdisk /dev/sda. Im trying to encrypt /dev/sda2 with cryptsetup but after executing "cryptsetup luksOpen /dev/sda2 acerluks i get the response "/dev/sda2 is not a valid LUKS device."

I am using the correct 'types' which are /dev/sda1 Linux
and Linux LVM for /dev/sda2

Now i have tried creating them separately e.g. fdisk /dev/sda1 and then /dev/sda2 and then tried again but i get the same response.

sorry for the lack of information. Any help would be greatly appreciated

crts · 12-01-2010, 10:56 AM

Quote:

Originally Posted by bigbooty

So after creating the partitions needed: /dev/sda1 and /dev/sda2.
This is all under fdisk /dev/sda. Im trying to encrypt /dev/sda2 with cryptsetup but after executing "cryptsetup luksOpen /dev/sda2 acerluks i get the response "/dev/sda2 is not a valid LUKS device."

Hi,

first of all, it is recommended to fill the device with random data before you encrypt it

Code:

dd if=/dev/urandom of=/dev/sda2 bs=1M

Then you need something like,

Code:

cryptsetup luksFormat /dev/sda2 --cipher aes-cbc-essiv:sha256 --key-size 256 --verify-passphrase# THIS WILL ERASE ALL DATA ON /dev/sda2

Afterwards you can open the device with your command and then mount it. The manpage has more useful info on that matter:

Code:

man cryptsetup

It is also recommended to encrypt the swap partition. There are plenty of tutorials on how to do that.
Just google for 'cryptsetup swap tutorial'.

stress_junkie · 12-01-2010, 11:08 AM

Quote:

Originally Posted by bigbooty

Now i have tried creating them separately e.g. fdisk /dev/sda1 and then /dev/sda2 and then tried again but

Actually there are people who say that fdisk is buggy and that you should use cfdisk to create partitions.