Linux - Encrypt an External USB Drive (dm-crypt without LUKS)
Date - February 10, 2011

Note - dm-crypt alone leaves no identifiable header on the partition (unlike dm-crypt with LUKS).

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1. Urandom the drive and then fdisk it. Example assumes /dev/sdc is external disk.

	dd if=/dev/urandom of=/dev/sdc bs=1M
	fdisk /dev/sdc

2. Initialize the encrypted partition, set the initial key and map the name (stick).

	cryptsetup --verbose --verify-passphrase create stick /dev/sdc1

3. Format the encrypted partition.

	mkfs.ext3 -j /dev/mapper/stick

4. Mount the encrypted partition.

	mkdir /mnt/stick
	mount /dev/mapper/stick /mnt/stick

5. Umount and close the encrypted partition
	
	umount /dev/mapper/stick
	cryptsetup remove stick 

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For day to day use

To Mount

	cryptsetup create stick /dev/sdc1 && mount /dev/mapper/stick /mnt/stick

To Unmount

	cd ~ && umount /dev/mapper/stick && cryptsetup remove stick

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Copyright 2011 '16 Systems'. All rights reserved.

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