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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../intro.html">Introduction</a></li><li class="chapter-item expanded "><a href="../shells/index.html"><strong aria-hidden="true">1.</strong> Shells</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../shells/zsh.html"><strong aria-hidden="true">1.1.</strong> zsh</a></li><li class="chapter-item expanded "><a href="../shells/bash.html"><strong aria-hidden="true">1.2.</strong> bash</a></li><li class="chapter-item expanded "><a href="../shells/fish.html"><strong aria-hidden="true">1.3.</strong> fish</a></li></ol></li><li class="chapter-item expanded "><a href="../cli/index.html"><strong aria-hidden="true">2.</strong> CLI foo</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../cli/awk.html"><strong aria-hidden="true">2.1.</strong> awk</a></li><li class="chapter-item expanded "><a href="../cli/sed.html"><strong aria-hidden="true">2.2.</strong> sed</a></li><li 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<h1 id="cryptsetup8"><a class="header" href="#cryptsetup8"><a href="https://www.man7.org/linux/man-pages/man8/cryptsetup.8.html">cryptsetup(8)</a></a></h1>
<pre><code class="language-text">cryptsetup <action> [opts] <action args>
action:
open <dev> <name> --type <type> Open (decrypt) <dev> and map with <name>.
Mapped as /dev/mapper/<name>.
Type: {luks,plain,tcrypt,bitlk}
close <name> Close existing mapping <name>.
status <name> Print status for mapping <name>.
luksFormat <dev> Create new LUKS partition and set initial passphrase.
(Keyslot 0)
luksAddKey <dev> Add a new passphrase.
luksRemoveKey <dev> Remove existing passphrase.
luksChangeKey <dev> Change existing passphrase.
lusDump <dev> Dump LUKS header for device.
</code></pre>
<h2 id="example-create-luks-encrypted-disk"><a class="header" href="#example-create-luks-encrypted-disk">Example: Create <code>LUKS</code> encrypted disk.</a></h2>
<p>For this example we use a file as backing storage and set it up as
<a href="https://man7.org/linux/man-pages/man4/loop.4.html">loop(4)</a> device. The loop device can be replaced by any block
device file.</p>
<blockquote>
<p>Optional: Overwrite existing data on disk.<br />
<code>sudo dd if=/dev/urandom of=/dev/sdX bs=1M</code></p>
</blockquote>
<p>First create the backing file and setup the loop device.</p>
<pre><code class="language-sh"># Create 100MB file.
dd if=/dev/zero of=blkfile bs=1M count=100
# Attach file to first free (-f) loop device
sudo losetup -f ./blkfile
# List loop devices.
sudo losetup -l
# NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO LOG-SEC
# /dev/loop0 0 0 0 0 /home/johannst/blkfile 0 512
</code></pre>
<p>Create a new LUKS partition and format new filesystem.</p>
<pre><code class="language-sh"># Initialize LUKS partition and set initial passphrase.
sudo cryptsetup luksFormat /dev/loop0
file blkfile
# blkfile: LUKS encrypted file, ver 2 [, , sha256] UUID: 8...
# Open (decrypt) the LUKS device, it will be mapped under /dev/mapper/loop0.
sudo cryptsetup open --type luks /dev/loop0 loop0
# Format partition with new filesystem.
sudo mkfs.vfat /dev/mapper/loop0
lsblk -f
# NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
# loop0 crypto_LU 2 8...
# └─loop0 vfat FAT16 D... 83.8M 0% /home/johannst/mnt
# Close (re-encrypt) LUKS device.
sudo cryptsetup close loop0
</code></pre>
<h2 id="example-using-an-existing-luks-device"><a class="header" href="#example-using-an-existing-luks-device">Example: Using an existing LUKS device.</a></h2>
<pre><code class="language-sh"># Open (decrypt) the LUKS device, it will be mapped under /dev/mapper/loop0.
sudo cryptsetup open --type luks /dev/loop0 loop0
# Mount filesystem.
sudo mount /dev/mapper/loop0 <mntpoint>
# Use disk ...
# Unmount filesystem.
sudo umount <mntpoint>
# Close (re-encrypt) LUKS device.
sudo cryptsetup close loop0
</code></pre>
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