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104<h1 id="gnupg-signature">GnuPG signature</h1>
105<h2 id="introduction">Introduction</h2>
106<h3 id="pgp-and-gpg">PGP and GPG</h3>
107<p><a href="https://gnupg.org/">Gnu Privacy Guard</a> (GnuPG) is an Open Source implementation of the <a href="https://en.wikipedia.org/wiki/Pretty_Good_Privacy#OpenPGP">Pretty Good [](.html)<br />
108Privacy</a> (OpenPGP) specification. Its main purposes are digital authentication,<br />
109signature and encryption.</p>
110<p>It is often used by the <a href="https://en.wikipedia.org/wiki/Free_and_open-source_software">FLOSS</a> community to verify:<a href=".html"></a></p>
111<ul>
112<li>Linux package signatures: Debian <a href="https://wiki.debian.org/SecureApt">SecureApt</a>, ArchLinux <a href="https://www.archlinux.org/master-keys/">Master [](.html)<br />
113Keys</a></li>
114<li><a href="https://en.wikipedia.org/wiki/Revision_control">SCM</a> releases &amp; maintainer identity<a href=".html"></a></li>
115</ul>
116<h3 id="trust">Trust</h3>
117<p>To quote Phil Pennock (the author of the <a href="https://bitbucket.org/skskeyserver/sks-keyserver/wiki/Home">SKS</a> key server - <a href="http://sks.spodhuis.org/" class="uri">http://sks.spodhuis.org/</a>):<a href=".html"></a></p>
118<blockquote>
119<p>You MUST understand that presence of data in the keyserver (pools) in no way connotes trust. Anyone can generate a key, with any name or email address, and upload it. All security and trust comes from evaluating security at the “object level”, via PGP Web-Of-Trust signatures. This keyserver makes it possible to retrieve keys, looking them up via various indices, but the collection of keys in this public pool is KNOWN to contain malicious and fraudulent keys. It is the common expectation of server operators that users understand this and use software which, like all known common OpenPGP implementations, evaluates trust accordingly. This expectation is so common that it is not normally explicitly stated.</p>
120</blockquote>
121<p>Trust can be gained by having your key signed by other people (and signing their key back, too :) ), for instance during <a href="https://en.wikipedia.org/wiki/Key_signing_party">key signing parties</a>, see:<a href=".html"></a></p>
122<ul>
123<li><a href="http://www.cryptnet.net/fdp/crypto/keysigning_party/en/keysigning_party.html">The Keysigning party HOWTO</a><a href=".html"></a></li>
124<li><a href="https://en.wikipedia.org/wiki/Web_of_trust">Web of trust</a><a href=".html"></a></li>
125</ul>
126<h2 id="generate-a-gpg-key">Generate a GPG key</h2>
127<ul>
128<li><a href="http://stackoverflow.com/a/16725717">Generating a GPG key for Git tagging</a> (StackOverflow)<a href=".html"></a></li>
129<li><a href="https://help.github.com/articles/generating-a-gpg-key/">Generating a GPG key</a> (GitHub)<a href=".html"></a></li>
130</ul>
131<h3 id="gpg---provide-identity-information">gpg - provide identity information</h3>
132<div class="sourceCode"><pre class="sourceCode bash"><code class="sourceCode bash">$ <span class="ex">gpg</span> --gen-key
133
134<span class="ex">gpg</span> (GnuPG) <span class="ex">2.1.6</span><span class="kw">;</span> <span class="ex">Copyright</span> (C) <span class="ex">2015</span> Free Software Foundation, Inc.
135<span class="ex">This</span> is free software: you are free to change and redistribute it.
136<span class="ex">There</span> is NO WARRANTY, to the extent permitted by law.
137
138<span class="ex">Note</span>: Use <span class="st">&quot;gpg2 --full-gen-key&quot;</span> for a full featured key generation dialog.
139
140<span class="ex">GnuPG</span> needs to construct a user ID to identify your key.
141
142<span class="ex">Real</span> name: Marvin the Paranoid Android
143<span class="ex">Email</span> address: marvin@h2g2.net
144<span class="ex">You</span> selected this USER-ID:
145 <span class="st">&quot;Marvin the Paranoid Android &lt;marvin@h2g2.net&gt;&quot;</span>
146
147<span class="ex">Change</span> (N)<span class="ex">ame</span>, (E)<span class="ex">mail</span>, or (O)<span class="ex">kay</span>/<span class="kw">(</span><span class="ex">Q</span><span class="kw">)</span><span class="ex">uit?</span> o
148<span class="ex">We</span> need to generate a lot of random bytes. It is a good idea to perform
149<span class="ex">some</span> other action (type on the keyboard, move the mouse, utilize the
150<span class="ex">disks</span>) <span class="ex">during</span> the prime generation<span class="kw">;</span> <span class="ex">this</span> gives the random number
151<span class="ex">generator</span> a better chance to gain enough entropy.</code></pre></div>
152<h3 id="gpg---entropy-interlude">gpg - entropy interlude</h3>
153<p>At this point, you will:</p>
154<ul>
155<li>be prompted for a secure password to protect your key (the input method will depend on your Desktop Environment and configuration)</li>
156<li>be asked to use your machine's input devices (mouse, keyboard, etc.) to generate random entropy; this step <em>may take some time</em></li>
157</ul>
158<h3 id="gpg---key-creation-confirmation">gpg - key creation confirmation</h3>
159<div class="sourceCode"><pre class="sourceCode bash"><code class="sourceCode bash"><span class="ex">gpg</span>: key A9D53A3E marked as ultimately trusted
160<span class="ex">public</span> and secret key created and signed.
161
162<span class="ex">gpg</span>: checking the trustdb
163<span class="ex">gpg</span>: 3 marginal(s) <span class="ex">needed</span>, 1 complete(s) <span class="ex">needed</span>, PGP trust model
164<span class="ex">gpg</span>: depth: 0 valid: 2 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 2u
165<span class="ex">pub</span> rsa2048/A9D53A3E 2015-07-31
166 <span class="ex">Key</span> fingerprint = AF2A 5381 E54B 2FD2 14C4 A9A3 0E35 ACA4 A9D5 3A3E
167<span class="ex">uid</span> [ultimate] Marvin the Paranoid Android <span class="op">&lt;</span>marvin@h2g2.net<span class="op">&gt;</span>[](.html)
168<span class="ex">sub</span> rsa2048/8C0EACF1 2015-07-31</code></pre></div>
169<h3 id="gpg---submit-your-public-key-to-a-pgp-server-optional">gpg - submit your public key to a PGP server (Optional)</h3>
170<div class="sourceCode"><pre class="sourceCode bash"><code class="sourceCode bash">$ <span class="ex">gpg</span> --keyserver pgp.mit.edu --send-keys A9D53A3E
171<span class="ex">gpg</span>: sending key A9D53A3E to hkp server pgp.mit.edu</code></pre></div>
172<h2 id="create-and-push-a-gpg-signed-tag">Create and push a GPG-signed tag</h2>
173<p>See <a href="Release-Shaarli.html">Release Shaarli</a>.</p>
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