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Kryptographie #17 - Output Feedback Mode und Counter Mode

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The Morpheus Tutorials

The Morpheus Tutorials

8 жыл бұрын

In this tutorial I will show you other two ways how to code more than one block. Here's the Output Feedback Mode and Counter Mode.
Book recommendation: Introduction to Modern Cryptography by Katz and Lindell: amzn.to/2qu6CNb
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Playlist: • Kryptographie

Пікірлер: 7
@MarsMasterLP
@MarsMasterLP 8 жыл бұрын
also wird für die Modi garkein seed mehr benötigt sondern ist jetzt quasi der Initialisierungsvektor oder der ctr unser seed in der Pseudozufallsfunktion ? Und es ist der gleiche schlüssel auf alle anwendbar oder und man hat noch gleiche sicherheit ?
@TheMorpheusTutorials
@TheMorpheusTutorials 8 жыл бұрын
+MarsMasterLP genauso ist's gedacht. Allerdings müssen Key und Nachricht immer noch perfekt zufällig aussehen. Wie man das macht, dazu kommen wir später =)
@gtb7878
@gtb7878 5 жыл бұрын
Wenn ich per OFB verschlüssele und die Nachricht lang ist, steigt dann nicht die Dauer zum Entschlüsseln extrem an, wenn die Funktion verschachtelt wird? Oder wird einfach das zufallsgenerierte weitergegeben?
@TheMorpheusTutorials
@TheMorpheusTutorials 5 жыл бұрын
Du gibst einfach auch den IV mit und die ciphertexte 🙂
@masterblub89
@masterblub89 8 жыл бұрын
kannst du die folien vill. ihrgendwie zur Verfügung stellen? :)
@TheMorpheusTutorials
@TheMorpheusTutorials 8 жыл бұрын
Hmm.. Folien sind es nicht wirklich aber ich kann die Aufschriebe demnächst mal hochladen.
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