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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

gfjjbz r 1 � r 2 � r

gfjjbz r 1 � r 2 � r 3 … � r n r gen Key generation generation of a random number r for the key generation: XOR of r 1, created in device, r 2, delivered by producer, r 3, delivered by user, r n, calculated from keystroke intervals. 137

Whom are keys assigned to? Comments on key exchange 1. individual participants asymmetric systems 2. pair relations symmetric systems 3. groups – How many keys have to be exchanged? n participants asymmetric systems n per system symmetric systems n ��(n-1) When are keys generated and exchanged? Security of key exchange limits security available by cryptography: execute several initial key exchanges 138

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