SlideShare ist ein Scribd-Unternehmen logo
Warum senden wir E-Mails eigentlich immer noch wie
Postkarten – leicht für Dritte lesbar und unsicher ob
wirklich vom genannten Absender??
Jörg Meier
E-MAIL
-SIGNATUREN UND
-VERSCHLÜSSELUNG
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WUNSCH
Eigenschaften
Manipulationssicher
Kein Abhören möglich
Rechtssichere Kommunikation
WiseVersa - E-Mail-Signaturen und -verschlüsselung
Lösungen
WiseVersa - E-Mail-Signaturen und -verschlüsselung
PUBLIC-KEY-INFRASTRUKTUR
Public-Key-Infrastruktur –
kryptografisches Verfahren
Öffentlicher und
Privater Schlüssel
WiseVersa - E-Mail-Signaturen und -verschlüsselung
VERFAHREN
Signieren – „Ich bin wirklich der Absender
meiner Nachricht und sie wurde nicht verfälscht“
Signatur meiner E-Mail mit meinem privaten
Schlüssel
Versand der Nachricht inkl. dieser Signatur
Prüfung der Signatur durch jeden möglich -
mittels meines öffentlichen Schlüssels
Veränderung der Nachricht führt zur
automatisch Ungültigkeit der Signatur
Verschlüsseln – „Keiner, außer dem Empfänger,
kann die Nachricht lesen“
Gleiches Prinzip aber Absender verschlüsselt mit
öffentlichem Schlüssel des Empfängers
Ich muss den Schlüssel des Empfängers haben –
oder finden können
WiseVersa - E-Mail-Signaturen und -verschlüsselung
SIGNIEREN IM DETAIL
Aus http://de.wikipedia.org/wiki/Digitale_Signatur
WiseVersa - E-Mail-Signaturen und -verschlüsselung
Praxis
WiseVersa - E-Mail-Signaturen und -verschlüsselung
IMPLEMENTIERUNGEN
Verfügbare Implementierungen
openPGP – empfohlen vom BSI
Leider kaum „out-of-the-box“-Support in
Mailprogrammen oder gar Smartphones
S/MIME
Fast von allen Programmen unterstützt
Gültigkeit von Signaturen werden direkt
angezeigt
WiseVersa - E-Mail-Signaturen und -verschlüsselung
PKI
Zertifikate
Zertifizierungsstellen prüfen und bestätigen die
Herkunft von Schlüsseln
„Trust-Center X bestätigt durch
Ausweisüberprüfung, dass mein öffentlicher
Schlüssel auch zu „Jörg Meier, Nürnberg“ gehört“
Web-of-Trust
Teilnehmer bestätigen sich selbst gegenseitig die
Echtheit der Schlüssel
WiseVersa - E-Mail-Signaturen und -verschlüsselung
RECHTSSICHERHEIT
„qualifizierte elektronische Signatur“
Hohe Anforderungen an die Zertifizierungsstelle
Chipkarten beim Anwender
Neuer Personalausweis kann es!
WiseVersa - E-Mail-Signaturen und -verschlüsselung
S/MIME
S/MIME
X.509-basierte Zertifikate
Klasse 1
Echtheit der E-mail-Adresse
Klasse 2
Zusätzlich
Name
Organisation/Firma
Klasse 3
persönlich ausweisen
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WIE GEHT‘S?
Signieren
Wir brauchen
eigenes zertifiziertes Schlüsselpaar
CA aussuchen
Möglichkeiten einer CA
Bundesdruckerei
http://www.bundesdruckerei.de/de/176-d-trust-
softtoken-class-ii
• Inkl. Identitätscheck per Post
• Kosten: 60 € für 2 Jahre pro User
Comodo FREE Personal Email Certificate
http://www.comodo.com
• Ohne Check
• kostenfrei
Zertifikat in Outlook aktivieren
Auch auf iPhone und Co. kann es verwendet
werden
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WIE GEHT‘S?
Verschlüsselung
[beim nächsten Mal]
WiseVersa - E-Mail-Signaturen und -verschlüsselung
WiseVersa - E-Mail-Signaturen und -verschlüsselung
PUNKTGENAU.
mediendesign AG
für Informationsmanagement und Unternehmenskommunikation
Bartholomäusstr. 26 . 90489 Nürnberg . Deutschland
Tel +49 911 - 39 36 00
www.mediendesign.de
WiseVersa - E-Mail-Signaturen und -verschlüsselung

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E-Mail-Signaturen und -Verschlüsselung