April 2016
Intermediate to advanced
944 pages
27h 6m
German
Content preview from Kryptografie
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19 Kryptografische Zufallsgeneratoren
Zufallszahlen spielen in der Kryptografie eine wichtige Rolle. Alice und Bob brauchen sie vor allem, um Schlüssel zu generieren. Dies kann ein AES-Schlüssel sein (128 bis 256 Bit) oder auch ein One-Time-Pad-Schlüssel, der so lang ist wie die zu verschlüsselnde Nachricht. Als RSA-Schlüssel kann Alice zwar keine beliebige Zufallszahl verwenden, da ein solcher Schlüssel aus zwei Primzahlen berechnet wird. Alle praktikablen Primzahlgeneratoren sind jedoch gewöhnliche Zufallsgeneratoren, die Nichtprimzahlen verwerfen. Public-Key-Verfahren, die wie Diffie-Hellman, ElGamal oder DSA auf dem diskreten Logarithmus basieren, ...
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