GnuPG
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gpg.html
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gpg.html
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<!doctype html>
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<html lang="de">
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<meta charset="utf-8">
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<title>Verschlüsselung mit GnuPG</title>
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<meta name="description" content="Verschlüsselung mit GnuPG ">
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<meta name="author" content="Daniel Schubert">
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<!-- Any section element inside of this container is displayed as a slide -->
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<div class="slides">
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<section data-transition="slide" data-background="#4d7e65" data-background-transition="convex">
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<h1>Verschlüsselung mit GnuPG</h1>
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</section>
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<section>
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<h3>Geschichte</h3>
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<ul>
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<li class="fragment">1991 - Phil Zimmermann - Pretty Good Privacy ( PGP ).</li>
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<li class="fragment">Exportbeschränkungen der USA verhinderten Internationale Verbreitung</li>
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<li class="fragment">Der Quellcode wurde 1995 als Buch „PGP Source Code and Internals“ exportiert ;-) </li>
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<li class="fragment">1997 - Aufkauf durch McAffee: Quellcode wurde nicht mehr offengelegt</li>
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<li class="fragment">1997 - OpenPGP Standard</li>
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<li class="fragment">1997 - Werner Koch veröffentlicht GnuPG unter der GPL</li>
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</ul>
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</section>
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<section>
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<h3>Funktionsweise</h3>
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<h4>Key Generierung</h4>
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<img style="max-height: 50vh" src="img/Orange_blue_public_private_keygeneration_de.svg">
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</section>
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<section>
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<h4>Verschlüsselung</h4>
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<img src="img/Orange_blue_public_key_cryptography_de.svg">
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</section>
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<section>
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<h4>Signierung</h4>
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<img src="img/Orange_blue_digital_signature_de.svg">
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</section>
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<section>
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<h4>Verschlüsselung für jmd. Anderen</h4>
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<img src="img/Public_key_encryption.svg">
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</section>
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<section>
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<h4>Schlüsselaustausch</h4>
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<ul>
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<li class="fragment ">über Schlüsselserver</li>
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<li class="fragment ">direkt ( per mail oder USB-Stick )</li>
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<li class="fragment ">->dann sollte der Fingerprint verifiziert werden</li>
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</ul>
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<p class="fragment ">Der Private Schlüssel muss sicher verwahrt sein, sonst nützt alles nix.
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</section>
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<section>
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<h4>KeyServer</h4>
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<ul>
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<li class="fragment ">zur Veröffentlichung d. öffentlichen Keys</li>
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<li class="fragment ">Obacht: einmal veröffentlicht nicht mehr entfernbar</li>
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<li class="fragment ">öffentlicher Key kann widerrufen werden</li>
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<li class="fragment "> ->Widerrufszertifikat</li>
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</ul>
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</section>
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<section>
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<h4>Zusammenfassung - Verschlüsselung</h4>
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<ol>
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<li class="fragment ">Schlüsselpaar generieren: <br>Öffentlichen u. Privaten Key</li>
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<li class="fragment "><span class="fragment highlight-red">Öffentlichen Key</span> weitergeben</li>
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<li class="fragment "><span class="fragment highlight-blue">Privaten Key</span> sicher verwahren</li>
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<li class="fragment ">Verschlüsselung d. Nachricht m. öffentlichem Schlüssel </li>
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<li class="fragment ">Entschlüsselung d. Nachricht m. privatem Schlüssel</li>
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<li class="fragment ">Mit dem <span class="fragment highlight-red">öffentlichen Schlüssel</span> verschlüsseltes kann nur mit dem <span class="fragment highlight-blue">privaten Schlüssel</span> entschlüsselt werden </li>
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</ol>
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</section>
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<section>
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<h4>Zusammenfassung - Signierung</h4>
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<ul>
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<li class="fragment ">Signierung garantiert dass die Nachricht unverändert ankam</li>
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<li class="fragment ">Signierung mit <span class="fragment highlight-blue">privatem Key</span></li>
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<li class="fragment ">überprüfung d. Signierung mit <span class="fragment highlight-red">öffentlichem Key</span></li>
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</ul>
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</section>
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<section>
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<h4>WOT - Web of Trust</h4>
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<ul>
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<li class="fragment ">Nutzer signieren ihre <span class="fragment highlight-red">öffentlichen</span> Schlüssel gegenseitig</li>
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<li class="fragment ">Ausdruck des Vertrauens, dass ein Schlüssel einer best. Person gehört</li>
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</ul>
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</section>
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<section>
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<h4>Programme die GnuPG unterstützen:</h4>
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<table><tbody><tr><td> <a href="https://wiki.ubuntuusers.de/Evolution/#GnuPG" class="internal">Evolution</a> </td><td> E-Mail </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/Thunderbird/Enigmail/" class="internal">Thunderbird</a> </td><td> E-Mail </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/KMail/Verschl%C3%BCsselung/" class="internal">KMail</a> </td><td> E-Mail </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/Claws_Mail/Plugins/#OpenPGP-Verschluesselung-mit-GnuPG" class="internal">Claws Mail</a> </td><td> E-Mail </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/Gajim/#c2c-Verschluesselung" class="internal">Gajim</a> </td><td> Jabber/Instant Messenger </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/Psi/#Verschluesselung" class="internal">Psi</a> </td><td> Jabber/Instant Messenger </td></tr><tr><td> <a href="https://wiki.ubuntuusers.de/Kopete/#Module" class="internal">Kopete</a> </td><td> Jabber/Instant Messenger </td></tr><tr><td><a href="https://gpg4win.de/index-de.html">GPG4Win</a> </td><td> Tools für Windows </td></tr></tbody></table>
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</section>
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<section>
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<h3>Mit-Mach-Teil</h3>
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Schlüsselpaar generieren
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<pre><code>~$ gpg --full-gen-key </code></pre>
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<p>Ausgabe:
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<pre><code>Bitte wählen Sie, welche Art von Schlüssel Sie möchten:
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(1) RSA und RSA (voreingestellt)
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(2) DSA und Elgamal
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(3) DSA (nur unterschreiben/beglaubigen)
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(4) RSA (nur signieren/beglaubigen)
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Ihre Auswahl?</code></pre>
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</section>
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<section>
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<p>Liste öffentliche Schlüssel
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<pre><code>~$ gpg --list-keys
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gpg -k </code></pre>
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<p>Liste private Schlüssel
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<pre><code>~$ gpg --list-secret-keys
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gpg -K
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</code></pre>
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</section>
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<section>
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<h4>Wiederrufszertifikat</h4>
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<pre><code>~$ gpg --output Widerruf_Kennung.asc --gen-revoke Kennung </code></pre>
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<p>Dieses Zertifikat einfach in den Keyring importieren -> Schlüssel ungültig
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</section>
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<section>
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<h4>Schlüssel exportieren</h4>
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<p>öffentlicher Key
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<pre><code>~$ gpg -a --output gpg-key.asc --export KEY-ID</code></pre>
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<p>Privater Key
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<pre><code>~$ gpg -a --output gpg-secret-key.asc --export-secret-keys KEY-ID </code></pre>
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</section>
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<section>
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<h4>Schlüssel suchen</h4>
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<pre><code>~$ gpg --search-keys "Vorname Nachname"</code></pre>
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<p>Schlüssel runterladen
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<pre><code>~$ gpg --recv-keys Key_Id</code></pre>
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</section>
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<section>
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GUI Frontend dafür: Seahorse
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<pre><code>~$ sudo apt install seahorse</code></pre>
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</section>
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<section>
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<span style="color: orange">Aufgabe:</span><p> Tauscht eure öffentlichen Schlüssel; <br>Sendet euch verschlüsselte Emails; <br>signiert gegenseitig eure Schlüssel; <br>Verschlüsselt eine Datei mit gpg.<br>
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Sucht meinen Schlüssel und sendet mir verschlüsselte emails ;-)
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</section>
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</div>
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</div>
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<script src="lib/js/head.min.js"></script>
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<script src="js/reveal.js"></script>
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<script>
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// More info https://github.com/hakimel/reveal.js#configuration
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transition: 'slide', // none/fade/slide/convex/concave/zoom
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</script>
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</body>
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</html>
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