31c3: ECCHacks
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Nach diesem Vortrag versteht man Elliptische Kurven Kryptografie. Ich klebe eine Stunde wie elektrisiert an den Vortragsfolien und habe alles begriffen -- und danach wieder alles vergessen! 🙂 Den Vortrag muss ich mir noch etwa zehn mal ansehen, um das Konzept wirklich vollständig zu begreifen. Aber es ist DIE Einführung, auf die ich schon immer gewartet habe: Wie funktioniert Elliptische Kurven Kryptografie? Ein Vortrag für komplett Ahnungslose.
„Tanja, hast du eine Uhr, für den Fall, dass jemand nicht weiss, wie eine Uhr aussieht?“, beginnt Dan J. Bernstein seine Ausführungen. So sanft fängt es an, am fiktiven Beispiel einer Uhr. „Wir machen zuerst Uhren-Kryptografie, zur Veranschaulichung.“
Horizontale X: Rechts ist 1, links ist -1.
Vertikale Y: Oben ist 1, unten ist -1.
Die Mitte ist 0.
Zwölf Uhr: Null nach rechts, eines nach oben: X: 0, Y: 1, also (0,1).
Drei Uhr: Eines nach rechts, null nach oben: X: 1, Y: 0, also (1,0)
…und so geht es weiter. Dann wird mit Uhrzeiten gerechnet in diesem Uhrenkoordinatensystem. Dann wird die Uhr etwas zusammengedrückt, und schwupps -- sind wir schon fast bei den elliptischen Kurven.
All of this is so fast that we can afford to encrypt all packets.
