presentazione-gnupg/backup_html/GnuPG - localhost.html
2018-11-01 17:00:27 +01:00

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<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>Lanonimato riguarda la riservatezza dellidentita</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 unaltra 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 unautorità 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 lautenticita 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 dellautenticita 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>
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chi non ha nulla da nascondere non ha nulla da temere
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