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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> 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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 &lt;action&gt; [opts] &lt;action args&gt;

action:
    open &lt;dev&gt; &lt;name&gt; --type &lt;type&gt;    Open (decrypt) &lt;dev&gt; and map with &lt;name&gt;.
                                       Mapped as /dev/mapper/&lt;name&gt;.
                                       Type: {luks,plain,tcrypt,bitlk}
    close &lt;name&gt;                       Close existing mapping &lt;name&gt;.
    status &lt;name&gt;                      Print status for mapping &lt;name&gt;.

    luksFormat &lt;dev&gt;                   Create new LUKS partition and set initial passphrase.
                                       (Keyslot 0)
    luksAddKey &lt;dev&gt;                   Add a new passphrase.
    luksRemoveKey &lt;dev&gt;                Remove existing passphrase.
    luksChangeKey &lt;dev&gt;                Change existing passphrase.
    lusDump &lt;dev&gt;                      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 &lt;mntpoint&gt;

# Use disk ...

# Unmount filesystem.
sudo umount &lt;mntpoint&gt;

# Close (re-encrypt) LUKS device.
sudo cryptsetup close loop0
</code></pre>

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