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<body style="transition: -webkit-transform 0.8s ease 0s;">
<div class="reveal slide center has-vertical-slides has-horizontal-slides ready" role="application" data-transition-speed="fast" data-background-transition="fade">
<div class="slides" style="width: 960px; height: 700px; left: 50%; top: 50%; bottom: auto; right: auto; transform: translate(-50%, -50%) scale(0.9984);">
<section style="top: 226px; display: block;" class="past" aria-hidden="true" hidden="">
<p><img src="GnuPG%20-%20localhost_files/gnupg_logo.png" alt="Gnupg"></p>
</section><section style="top: 42px; display: block;" class="present">
<h1 id="crittografia">Crittografia</h1>
<h2 id="a-cosa-serve">A cosa serve:</h2>
<ul>
<li><p>a difendere la propria privacy</p></li>
<li><p><span class="fragment visible current-fragment" data-fragment-index="0">
chi non ha nulla da nascondere non ha nulla da temere
</span> <span class="fragment" data-fragment-index="1">
(Adolf Hitler, 1936)
</span></p></li>
<li><span class="fragment" data-fragment-index="2">
comunicazioni private di qualsiasi natura
</span></li>
<li><span class="fragment" data-fragment-index="3">
crittazione di documenti
</span></li>
<li><span class="fragment" data-fragment-index="4">
verifica autenticita’ di documenti
</span></li>
<li><span class="fragment" data-fragment-index="5">
verifica integrita’ di documenti
</span></li>
</ul>
</section><section style="top: 135px; display: block;" class="future" aria-hidden="true" hidden="">
<h1 id="crittografia-1">Crittografia</h1>
<h3 id="privacy-e-anonimato">Privacy e anonimato</h3>
<ul>
<li><p>La privacy riguarda la riservatezza del contenuto delle comunicazioni/dati</p></li>
<li><p>L’anonimato riguarda la riservatezza dell’identita’</p></li>
</ul>
</section><section style="top: 99px; display: block;" class="future" aria-hidden="true" hidden="">
<h1 id="sicurezza">SICUREZZA</h1>
<p><img src="GnuPG%20-%20localhost_files/security.png" alt="security"></p>
</section><section style="top: 0px; display: none;" class="stack future" data-previous-indexv="2" aria-hidden="true" hidden="">
<section data-shortcode-section="" style="top: 211.5px; display: none;" class="past" aria-hidden="true" hidden="">
<h2 id="storia">Storia</h2>
<h4 id="pgp-pretty-good-privacy">PGP (Pretty Good Privacy)</h4>
<h5 id="nasce-nel-1991-ad-opera-di-phil-zimmerman">Nasce nel 1991 ad opera di Phil Zimmerman</h5>
</section><section class="past" style="top: 35.5px; display: none;" aria-hidden="true" hidden="">
<h2 id="storia-1">Storia</h2>
<h4 id="openpgp">OPENPGP</h4>
<p>E’ uno standard divenuto ufficiale nel 2007 che definisce come devono
funzionare i servizi per le comunicazioni elettroniche e il data
storage riguardo:</p>
<ul>
<li><p>Confidenzialità</p></li>
<li><p>Gestione delle chiavi</p></li>
<li><p>Autenticazione</p></li>
<li><p>Firma digitale</p></li>
</ul>
</section><section class="" style="top: 148.5px; display: none;" aria-hidden="true">
<h2 id="storia-2">Storia</h2>
<h4 id="gnupg-gnu-privacy-guard">GnuPG (Gnu Privacy Guard)</h4>
<ul>
<li><p>E’ una implementazione open source dello standard OpenPGP</p></li>
<li><p>Non ha nessuna interfaccia grafica nativa</p></li>
</ul>
</section>
</section><section style="top: 0px; display: none;" class="future" aria-hidden="true" hidden="">
<h4 id="crittografia-simmetrica">crittografia simmetrica</h4>
<h6 id="la-stessa-chiave-si-usa-per-crittare-e-decrittare"><em>la stessa chiave si usa per crittare e decrittare</em></h6>
<p>problema: come scambiarsi la chiave in modo sicuro ?</p>
<p><img src="GnuPG%20-%20localhost_files/Symmetric-Encryption.png" alt="crittografia simmetrica"></p>
</section><section style="top: 0px; display: none;" class="future" aria-hidden="true" hidden="">
<h4 id="crittografia-asimmetrica">crittografia asimmetrica</h4>
<h6 id="ci-sono-due-chiavi-una-per-crittare-pubblica-e-una-per-decrittare-privata"><em>ci sono due chiavi, una per crittare (pubblica) e una per decrittare (privata)</em></h6>
<p>non serve scambiarsi la chiave in modo sicuro</p>
<p><img src="GnuPG%20-%20localhost_files/Asymmetric-Encryption.png" alt="crittografia asimmetrica"></p>
</section><section style="top: 154px; display: none;" class="future" aria-hidden="true" hidden="">
<h3 id="la-firma-elettronica">La firma elettronica</h3>
<ul>
<li><p>autenticazione</p></li>
<li><p>integrità</p></li>
<li><p>E’ possibile firmare anche senza cifrare e/o viceversa</p></li>
<li><p>Si possono firmare messaggi e/o files/documenti</p></li>
</ul>
</section><section style="top: 74.5px; display: none;" class="future" aria-hidden="true" hidden="">
<h4 id="chiave-pubblica-e-chiave-privata">chiave pubblica e chiave privata</h4>
<h6 id="la-chiave-pubblica-serve-agli-altri-che-la-usano-per"><em>La chiave pubblica serve agli altri che la usano per:</em></h6>
<ol>
<li>crittare i messaggi che poi invieranno a te</li>
<li>verificare la firma dei msg che ricevono da te</li>
</ol>
<h4 id="toc_12">____________________</h4>
<h6 id="la-chiave-privata-e-usata-da-te-per"><em>La chiave privata e’ usata da te per:</em></h6>
<ol>
<li>firmare i messaggi che invierai ad altre persone</li>
<li>decrittare i messaggi che ricevi da altre persone</li>
<li>firmare le chiavi di altre persone</li>
</ol>
</section><section style="top: 0px; display: none;" class="stack future" data-previous-indexv="7" aria-hidden="true" hidden="">
<section data-shortcode-section="" style="top: 235.5px; display: none;" class="past" aria-hidden="true" hidden="">
<h2 id="le-chiavi-e-la-loro-gestione">Le chiavi e la loro gestione</h2>
</section><section class="past" style="top: 256.5px; display: none;" aria-hidden="true" hidden="">
<h3 id="user-id">User ID</h3>
<p><strong><em>email, non necessariamente nome e cognome</em></strong></p>
</section><section class="past" style="top: 0px; display: none;" aria-hidden="true" hidden="">
<h5 id="la-password-di-protezione-della-chiave">la password di protezione della chiave</h5>
<p><img src="GnuPG%20-%20localhost_files/password_strength.png" alt="password"></p>
</section><section class="past" style="top: 206px; display: none;" aria-hidden="true" hidden="">
<h2 id="la-scadenza">la scadenza</h2>
<ul>
<li><p>a cosa serve</p></li>
<li><p>estensione della scadenza</p></li>
</ul>
</section><section class="past" style="top: 235.5px; display: none;" aria-hidden="true" hidden="">
<h2 id="le-sottochiavi-subkeys">Le sottochiavi (subkeys)</h2>
</section><section class="past" style="top: 88.5px; display: none;" aria-hidden="true" hidden="">
<h2 id="revoca-delle-chiavi">Revoca delle chiavi</h2>
<h4 id="il-certificato-di-revoca">Il certificato di revoca</h4>
<pre><code class="hljs stata"><span class="hljs-keyword">Se</span> <span class="hljs-keyword">ci</span> si dimentica <span class="hljs-keyword">la</span> passphrase o <span class="hljs-keyword">se</span> <span class="hljs-keyword">la</span> propria chiave privata viene
compromessa o persa, questo certificato <span class="hljs-keyword">di</span> revoca può essere pubblicato
per segnalare ad altri che <span class="hljs-keyword">la</span> chiave pubblica non deve più essere usata.
Una chiave pubblica revocata non può più essere usata per cifrare futuri
messaggi.
<span class="hljs-keyword">La</span> revoca non influisce sulla propria capacità <span class="hljs-keyword">di</span> decifrare messaggi spediti
<span class="hljs-keyword">in</span> passato, <span class="hljs-keyword">se</span> si possiede ancora <span class="hljs-keyword">l</span>'accesso alla chiave privata.
Il certificato deve essere stampato <span class="hljs-keyword">e</span>/o salvato offline.
Chiunque abbia accesso al certificato <span class="hljs-keyword">di</span> revoca può rendere <span class="hljs-keyword">la</span> chiave
pubblica inutilizzabile.
</code></pre>
</section><section class="past" style="top: 123.5px; display: none;" aria-hidden="true" hidden="">
<h2 id="revoca-delle-chiavi-1">Revoca delle chiavi</h2>
<h4 id="i-revocatori-designati">I revocatori designati</h4>
<blockquote>
<p>Potete designare il possessore di un’altra chiave per revocare la vostra</p>
<p>Deve godere della vostra massima fiducia</p>
</blockquote>
</section><section class="" style="top: 20.5px; display: none;" aria-hidden="true">
<h2 id="i-keyservers">i keyservers</h2>
<p>Un keyserver e’ un database contenente chiavi pubbliche</p>
<ul>
<li><p>sono disponibili anche via web: <a href="https://pgp.mit.edu/">https://pgp.mit.edu</a></p></li>
<li><p>servono a:</p>
<ol>
<li>recuperare le chiavi di altri</li>
<li>caricare le proprie chiavi</li>
</ol></li>
<li><p><strong>una volta caricate le chiavi non si possono eliminare, solo revocare</strong></p></li>
<li><p>e’ cmq possibile modificare una chiave caricata, ad es. per aggiungere firme,
o cambiare la scadenza.</p></li>
</ul>
</section><section class="future" aria-hidden="true" style="top: 101.5px; display: none;" hidden="">
<h2 id="web-of-trust">web of trust</h2>
<p>OpenPGP anziché basarsi su un’autorità centralizzata o su una struttura gerarchica
prevede che ogni contatto imposti la fiducia verso gli altri e, a seconda della
fiducia che gli viene riconosciuta, possa garantire per quella di terzi.
È un metodo molto pratico per gruppi che non hanno un ordine gerarchico,
come possono essere appunto i contatti email e per cui sarebbe eccessivamente
oneroso o di difficile gestione il ricorso a una Certificate Authority.</p>
</section><section class="future" aria-hidden="true" style="top: 54.5px; display: none;" hidden="">
<h2 id="firma-delle-chiavi">firma delle chiavi</h2>
<h4 id="pgp-key-signing-party">pgp key signing party</h4>
<p>Si imposta il livello di confidenza riguardo l’autenticita’ della chiave pubblica e la sua corrispondenza con un dato contatto.</p>
<p>Firmando una chiave pubblica si garantisce della sua autenticita’.
Di default la firma e’ solo locale, ma se si esporta quella chiave pubblica
su un keyserver, la propria firma diventera’ pubblica, e in tal caso la propria firma
avra’ il ruolo di garante dell’autenticita’ di quella chiave.</p>
</section>
</section><section style="top: 0px; display: none;" aria-hidden="true" class="future" hidden="">
<p>Esempio di msg cifrato:</p>
<pre><code class="hljs haml">-<span class="ruby">----<span class="hljs-keyword">BEGIN</span> PGP MESSAGE-----
</span>Version: GnuPG v2.1 (GNU/Linux)
owE1jMsNwjAUBH3gZMk9PClnUoBPUANpwElW2OBPZD8H0gd1UCP2gduuNDNfI
T4zCbQmtlbzGFM9T0jSD7QVvEzaPcUlBSSWHQclbnR9YWJNp5BFSLdR9CijF3
ybry/1Rsqn4la3a0JiIhLvnYGCu9HFtiC8oIxnlkeuIYe+EH=HgDq
-<span class="ruby">----<span class="hljs-keyword">END</span> PGP MESSAGE-----
</span></code></pre>
<p>Esempio di msg firmato:</p>
<pre><code class="hljs haml">-<span class="ruby">----<span class="hljs-keyword">BEGIN</span> PGP SIGNED MESSAGE-----
</span>Hash: SHA512
Ciao,
messaggio di prova
-<span class="ruby">----<span class="hljs-keyword">BEGIN</span> PGP SIGNATURE-----
</span>Version: GnuPG v2.1 (GNU/Linux)
iQGGBAEBCgBwBQJQRL0KMBSAAAAAACAAB3ByZWZlcnJlZC1lbWFpbC1lbmNvZGlu
Z0BwZ3AuY29tcGdwbWltZTgUgAAAAAAVABpwa2EtYWRkcmVzc0BnbnVwZy5vcmdt
CKV1lrxDLqrQeDE5Zbep3J1XL5ZJ4e98+CrRyKJkVXmKwH5+A/ySMk3CTNXKtoWT
3H34WvVdMTJb
=<span class="ruby">qU7I
</span>-<span class="ruby">----<span class="hljs-keyword">END</span> PGP SIGNATURE-----
</span></code></pre>
</section><section style="top: 0px; display: none;" aria-hidden="true" class="stack future" hidden="">
<section data-shortcode-section="" style="top: 239.5px; display: none;">
<h1 id="clients">Clients</h1>
<p><a href="https://www.gnupg.org/software/frontends.html">https://www.gnupg.org/software/frontends.html</a></p>
</section><section class="future" aria-hidden="true" style="top: 350px; display: none;">
<h1 id="windows">Windows</h1>
<p><a href="https://www.gpg4win.org/">gpg4win.org</a></p>
<p><a href="https://emailselfdefense.fsf.org/it/windows.html">emailselfdefense (in italiano)</a></p>
</section><section class="future" aria-hidden="true" style="top: 350px; display: none;">
<h1 id="linux">Linux</h1>
<p><a href="https://www.gnupg.org/">gnupg.org</a></p>
<p><a href="https://emailselfdefense.fsf.org/it/index.html">https://emailselfdefense.fsf.org/it/index.html</a></p>
</section><section class="future" aria-hidden="true" style="top: 350px; display: none;">
<h1 id="mac">Mac</h1>
<p><a href="https://www.gpgtools.org/">gpgtools.org</a></p>
<p><a href="https://emailselfdefense.fsf.org/it/mac.html">emailselfdefense (in italiano)</a></p>
</section><section class="future" aria-hidden="true" style="top: 350px; display: none;">
<h1 id="enigmail">Enigmail</h1>
<h4 id="enigmail-net-https-www-enigmail-net"><a href="https://www.enigmail.net/">enigmail.net</a></h4>
<h5 id="plugin-per-thunderbird">plugin per thunderbird</h5>
<p>guide molto ben fatte, ma in inglese:</p>
<ul>
<li><a href="https://ssd.eff.org/en/module/how-use-pgp-linux">https://ssd.eff.org/en/module/how-use-pgp-linux</a></li>
<li><a href="https://ssd.eff.org/en/module/how-use-pgp-mac-os-x">https://ssd.eff.org/en/module/how-use-pgp-mac-os-x</a></li>
<li><a href="https://ssd.eff.org/en/module/how-use-pgp-windows">https://ssd.eff.org/en/module/how-use-pgp-windows</a></li>
</ul>
</section>
</section><section style="top: 350px; display: none;" aria-hidden="true" class="future" hidden="">
<h1 id="fine">FINE</h1>
</section>
</div>
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chi non ha nulla da nascondere non ha nulla da temere
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