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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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href="../monitor/index.html"><strong aria-hidden="true">2.</strong> Resource analysis & monitor</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../monitor/lsof.html"><strong aria-hidden="true">2.1.</strong> lsof</a></li><li class="chapter-item expanded "><a href="../monitor/ss.html"><strong aria-hidden="true">2.2.</strong> ss</a></li><li class="chapter-item expanded "><a href="../monitor/pidstat.html"><strong aria-hidden="true">2.3.</strong> pidstat</a></li><li class="chapter-item expanded "><a href="../monitor/pgrep.html"><strong aria-hidden="true">2.4.</strong> pgrep</a></li><li class="chapter-item expanded "><a href="../monitor/pmap.html"><strong aria-hidden="true">2.5.</strong> pmap</a></li><li class="chapter-item expanded "><a href="../monitor/pstack.html"><strong aria-hidden="true">2.6.</strong> pstack</a></li></ol></li><li class="chapter-item expanded "><a href="../trace_profile/index.html"><strong aria-hidden="true">3.</strong> Trace and Profile</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../trace_profile/strace.html"><strong aria-hidden="true">3.1.</strong> strace</a></li><li class="chapter-item expanded "><a href="../trace_profile/ltrace.html"><strong aria-hidden="true">3.2.</strong> ltrace</a></li><li class="chapter-item expanded "><a href="../trace_profile/perf.html"><strong aria-hidden="true">3.3.</strong> perf</a></li><li class="chapter-item expanded "><a href="../trace_profile/oprofile.html"><strong aria-hidden="true">3.4.</strong> OProfile</a></li><li class="chapter-item expanded "><a href="../trace_profile/time.html"><strong aria-hidden="true">3.5.</strong> time</a></li></ol></li><li class="chapter-item expanded "><a href="../binary/index.html"><strong aria-hidden="true">4.</strong> Binary</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../binary/od.html"><strong aria-hidden="true">4.1.</strong> od</a></li><li class="chapter-item expanded "><a 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class="chapter-item expanded "><a href="../development/gcc.html"><strong aria-hidden="true">5.4.</strong> gcc</a></li><li class="chapter-item expanded "><a href="../development/make.html"><strong aria-hidden="true">5.5.</strong> make</a></li><li class="chapter-item expanded "><a href="../development/ld.so.html"><strong aria-hidden="true">5.6.</strong> ld.so</a></li><li class="chapter-item expanded "><a href="../development/symbolver.html"><strong aria-hidden="true">5.7.</strong> symbol versioning</a></li><li class="chapter-item expanded "><a href="../development/python.html"><strong aria-hidden="true">5.8.</strong> python</a></li><li class="chapter-item expanded "><a href="../development/gcov.html"><strong aria-hidden="true">5.9.</strong> gcov</a></li><li class="chapter-item expanded "><a href="../development/pgo.html"><strong aria-hidden="true">5.10.</strong> pgo</a></li></ol></li><li class="chapter-item expanded "><a href="../linux/index.html"><strong aria-hidden="true">6.</strong> Linux</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../linux/systemd.html"><strong aria-hidden="true">6.1.</strong> systemd</a></li><li class="chapter-item expanded "><a href="../linux/coredump.html"><strong aria-hidden="true">6.2.</strong> coredump</a></li><li class="chapter-item expanded "><a href="../linux/ptrace_scope.html"><strong aria-hidden="true">6.3.</strong> ptrace_scope</a></li><li class="chapter-item expanded "><a href="../linux/cryptsetup.html" class="active"><strong aria-hidden="true">6.4.</strong> cryptsetup</a></li><li class="chapter-item expanded "><a href="../linux/swap.html"><strong aria-hidden="true">6.5.</strong> swap</a></li><li class="chapter-item expanded "><a href="../linux/input.html"><strong aria-hidden="true">6.6.</strong> input</a></li><li class="chapter-item expanded "><a href="../linux/acl.html"><strong aria-hidden="true">6.7.</strong> acl</a></li><li class="chapter-item expanded "><a href="../linux/zfs.html"><strong aria-hidden="true">6.8.</strong> zfs</a></li></ol></li><li class="chapter-item expanded "><a href="../network/index.html"><strong aria-hidden="true">7.</strong> Network</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../network/tcpdump.html"><strong aria-hidden="true">7.1.</strong> tcpdump</a></li><li class="chapter-item expanded "><a href="../network/firewall-cmd.html"><strong aria-hidden="true">7.2.</strong> firewall-cmd</a></li><li class="chapter-item expanded "><a href="../network/nftables.html"><strong aria-hidden="true">7.3.</strong> nftables</a></li></ol></li><li class="chapter-item expanded "><a href="../web/index.html"><strong aria-hidden="true">8.</strong> Web</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../web/html.html"><strong aria-hidden="true">8.1.</strong> html</a></li><li class="chapter-item expanded "><a href="../web/chartjs.html"><strong aria-hidden="true">8.2.</strong> chartjs</a></li></ol></li><li class="chapter-item expanded "><a href="../arch/index.html"><strong aria-hidden="true">9.</strong> Arch</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../arch/x86_64.html"><strong aria-hidden="true">9.1.</strong> x86_64</a></li><li class="chapter-item expanded "><a href="../arch/arm64.html"><strong aria-hidden="true">9.2.</strong> arm64</a></li><li class="chapter-item expanded "><a href="../arch/armv7.html"><strong aria-hidden="true">9.3.</strong> armv7</a></li><li class="chapter-item expanded "><a href="../arch/riscv.html"><strong aria-hidden="true">9.4.</strong> riscv</a></li></ol></li></ol>
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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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