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<h1 id="gpg1"><a class="header" href="#gpg1">gpg(1)</a></h1>
<pre><code>gpg
-o|--output Specify output file
-a|--armor Create ascii output
-u|--local-user <name> Specify key for signing
-r|--recipient Encrypt for user
</code></pre>
<h2 id="generate-new-keypair"><a class="header" href="#generate-new-keypair">Generate new keypair</a></h2>
<pre><code class="language-bash">gpg --full-generate-key
</code></pre>
<h2 id="list-keys"><a class="header" href="#list-keys">List keys</a></h2>
<pre><code>gpg -k / --list-key # public keys
gpg -K / --list-secret-keys # secret keys
</code></pre>
<h2 id="edit-keys"><a class="header" href="#edit-keys">Edit keys</a></h2>
<pre><code class="language-bash">gpg --edit-key <KEY ID>
</code></pre>
<p>Gives prompt to modify <code>KEY ID</code>, common commands:</p>
<pre><code class="language-bash">help show help
save save & quit
list list keys and user IDs
key <N> select subkey <N>
uid <N> select user ID <N>
expire change expiration of selected key
adduid add user ID
deluid delete selected user ID
addkey add subkey
delkey delete selected subkey
</code></pre>
<h2 id="export--import-keys"><a class="header" href="#export--import-keys">Export & Import Keys</a></h2>
<pre><code class="language-bash">gpg --export --armor --output <KEY.PUB> <KEY ID>
gpg --export-secret-key --armor --output <KEY.PRIVATE> <KEY ID>
gpg --import <FILE>
</code></pre>
<h2 id="search--send-keys"><a class="header" href="#search--send-keys">Search & Send keys</a></h2>
<pre><code class="language-bash">gpg --keyserver <SERVER> --send-keys <KEY ID>
gpg --keyserver <SERVER> --search-keys <KEY ID>
</code></pre>
<h2 id="encrypt-passphrase"><a class="header" href="#encrypt-passphrase">Encrypt (passphrase)</a></h2>
<p>Encrypt file using <code>passphrase</code> and write encrypted data to <code><file>.gpg</code>.</p>
<pre><code class="language-bash">gpg --symmetric <file>
# Decrypt using passphrase
gpg -o <file> --decrypt <file>.gpg
</code></pre>
<h2 id="encrypt-public-key"><a class="header" href="#encrypt-public-key">Encrypt (public key)</a></h2>
<p>Encrypt file with <code>public key</code> of specified <code>recipient</code> and write encrypted
data to <code><file>.gpg</code>.</p>
<pre><code class="language-bash">gpg --encrypt -r foo@bar.de <file>
# Decrypt at foos side (private key required)
gpg -o <file> --decrypt <file>.gpg
</code></pre>
<h2 id="signing"><a class="header" href="#signing">Signing</a></h2>
<p>Generate a signed file and write to <code><file>.gpg</code>.</p>
<pre><code class="language-bash"># Sign with private key of foo@bar.de
gpg --sign -u foor@bar.de <file>
# Verify with public key of foo@bar.de
gpg --verify <file>
# Extract content from signed file
gpg -o <file> --decrypt <file>.gpg
</code></pre>
<blockquote>
<p>Without <code>-u</code> use first private key in list <code>gpg -K</code> for signing.</p>
</blockquote>
<p>Files can also be <code>signed</code> and <code>encrypted</code> at once, gpg will first sign the
file and then encrypt it.</p>
<pre><code class="language-bash">gpg --sign --encrypt -r <recipient> <file>
</code></pre>
<h2 id="signing-detached"><a class="header" href="#signing-detached">Signing (detached)</a></h2>
<p>Generate a <code>detached</code> signature and write to <code><file>.asc</code>.
Send <code><file>.asc</code> along with <code><file></code> when distributing.</p>
<pre><code class="language-bash">gpg --detach-sign --armor -u foor@bar.de <file>
# Verify
gpg --verify <file>.asc <file>
</code></pre>
<blockquote>
<p>Without <code>-u</code> use first private key in list <code>gpg -K</code> for signing.</p>
</blockquote>
<h2 id="abbreviations"><a class="header" href="#abbreviations">Abbreviations</a></h2>
<ul>
<li><code>sec</code> secret key</li>
<li><code>ssb</code> secret subkey</li>
<li><code>pub</code> public key</li>
<li><code>sub</code> public subkey</li>
</ul>
<p>Key usage flags:</p>
<ul>
<li><code>[S]</code> signing</li>
<li><code>[C]</code> create certificates</li>
<li><code>[E]</code> encrypting</li>
<li><code>[A]</code> authentication</li>
</ul>
<h2 id="keyservers"><a class="header" href="#keyservers">Keyservers</a></h2>
<ul>
<li>http://pgp.mit.edu</li>
<li>http://keyserver.ubuntu.com</li>
<li>hkps://pgp.mailbox.org</li>
</ul>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<h3 id="list-basic-key-information-from-file-with-long-keyids"><a class="header" href="#list-basic-key-information-from-file-with-long-keyids">List basic key information from file with long keyids</a></h3>
<pre><code class="language-bash">gpg --keyid-format 0xlong <key.asc>
</code></pre>
<h3 id="extend-expiring-key"><a class="header" href="#extend-expiring-key">Extend expiring key</a></h3>
<pre><code class="language-bash">gpg --edit-key <key id>
# By default we are on the primary key, can switch to sub key.
gpg> key 1
# Update the expire date.
gpg> expire
gpg> save
# Update keyserver(s) and/or export new pub keyfile.
</code></pre>
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