afewteks.com

Posted: **Tue Apr 26, 2011 1:46 pm**

Testing encryption:

Start with block device. I will be using /dev/sdc
create partition however needed.

Use dd to fill with random data.
Higher randomization but slower.

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dd if=/dev/urandom of=/dev/sdc1

Good randomization and faster.

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badblocks -c 10240 -s -w -t random -v /dev/sdc1

Format device

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cryptsetup luksFormat /dev/sdc1

Verify and Summary if wanted.

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cryptsetup isLuks /dev/sdb1 && echo Success

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cryptsetup luksDump /dev/sdb1

Create map for decrypted data
Use below to get and use UUID so if name changes no worries

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cryptsetup luksUUID /dev/sdb1

Create map

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cryptsetup luksOpen  /dev/sdb1 luks-uuid

Create FS

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mkfs.ext3 /dev/mapper/luks-uuid

Mount

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mount /dev/mapper/luks-uuid /mntpoint

Add the mapping information to /etc/crypttab

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luks-uuid uuid

Add to fstab

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/dev/mapper/luks-uuid /mntpoint ext3 defaults 0 0

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Block encryption

Block encryption