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211 <li><a class="toctree-l4" href="#gpg-entropy-interlude">gpg - entropy interlude</a></li>
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322 <h2 id="introduction">Introduction</h2>
323<h3 id="pgp-and-gpg">PGP and GPG</h3>
324<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
325Privacy</a> (OpenPGP) specification. Its main purposes are digital authentication,
326signature and encryption.</p>
327<p>It is often used by the <a href="https://en.wikipedia.org/wiki/Free_and_open-source_software">FLOSS</a> community to verify:
328- Linux package signatures: Debian <a href="https://wiki.debian.org/SecureApt">SecureApt</a>, ArchLinux <a href="https://www.archlinux.org/master-keys/">Master
329Keys</a>
330- <a href="https://en.wikipedia.org/wiki/Revision_control">SCM</a> releases &amp; maintainer identity</p>
331<h3 id="trust">Trust</h3>
332<p>To quote Phil Pennock (the author of the <a href="https://bitbucket.org/skskeyserver/sks-keyserver/wiki/Home">SKS</a> key server - http://sks.spodhuis.org/):</p>
333<blockquote>
334<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>
335</blockquote>
336<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:
337- <a href="http://www.cryptnet.net/fdp/crypto/keysigning_party/en/keysigning_party.html">The Keysigning party HOWTO</a>
338- <a href="https://en.wikipedia.org/wiki/Web_of_trust">Web of trust</a></p>
339<h2 id="generate-a-gpg-key">Generate a GPG key</h2>
340<ul>
341<li><a href="http://stackoverflow.com/a/16725717">Generating a GPG key for Git tagging</a> (StackOverflow)</li>
342<li><a href="https://help.github.com/articles/generating-a-gpg-key/">Generating a GPG key</a> (GitHub)</li>
343</ul>
344<h3 id="gpg-provide-identity-information">gpg - provide identity information</h3>
345<pre><code class="bash">$ gpg --gen-key
346
347gpg (GnuPG) 2.1.6; Copyright (C) 2015 Free Software Foundation, Inc.
348This is free software: you are free to change and redistribute it.
349There is NO WARRANTY, to the extent permitted by law.
350
351Note: Use &quot;gpg2 --full-gen-key&quot; for a full featured key generation dialog.
352
353GnuPG needs to construct a user ID to identify your key.
354
355Real name: Marvin the Paranoid Android
356Email address: marvin@h2g2.net
357You selected this USER-ID:
358 &quot;Marvin the Paranoid Android &lt;marvin@h2g2.net&gt;&quot;
359
360Change (N)ame, (E)mail, or (O)kay/(Q)uit? o
361We need to generate a lot of random bytes. It is a good idea to perform
362some other action (type on the keyboard, move the mouse, utilize the
363disks) during the prime generation; this gives the random number
364generator a better chance to gain enough entropy.
365</code></pre>
366
367<h3 id="gpg-entropy-interlude">gpg - entropy interlude</h3>
368<p>At this point, you will:
369- be prompted for a secure password to protect your key (the input method will depend on your Desktop Environment and configuration)
370- be asked to use your machine's input devices (mouse, keyboard, etc.) to generate random entropy; this step <em>may take some time</em> </p>
371<h3 id="gpg-key-creation-confirmation">gpg - key creation confirmation</h3>
372<pre><code class="bash">gpg: key A9D53A3E marked as ultimately trusted
373public and secret key created and signed.
374
375gpg: checking the trustdb
376gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
377gpg: depth: 0 valid: 2 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 2u
378pub rsa2048/A9D53A3E 2015-07-31
379 Key fingerprint = AF2A 5381 E54B 2FD2 14C4 A9A3 0E35 ACA4 A9D5 3A3E
380uid [ultimate] Marvin the Paranoid Android &lt;marvin@h2g2.net&gt;
381sub rsa2048/8C0EACF1 2015-07-31
382</code></pre>
383
384<h3 id="gpg-submit-your-public-key-to-a-pgp-server-optional">gpg - submit your public key to a PGP server (Optional)</h3>
385<pre><code class="bash">$ gpg --keyserver pgp.mit.edu --send-keys A9D53A3E
386gpg: sending key A9D53A3E to hkp server pgp.mit.edu
387</code></pre>
388
389<h2 id="create-and-push-a-gpg-signed-tag">Create and push a GPG-signed tag</h2>
390<p>See <a href="../Release Shaarli">Release Shaarli</a>.</p>
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