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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Combine: Hybrid

Combine: Hybrid cryptosystems (1) • from asymmetric systems: easy key distribution • from symmetric systems: efficiency (factor 100 ... 10000, SW and HW) How? use asymmetric system to distribute key for symmetric system Encryption: get c B choose k M A B c B(k),k(M) decrypt k with d B decrypt M with k 147

Hybrid cryptosystems (2) Even more efficient: part of M in first block If B is supposed also to use k: append s A(B,k) Authentication: k authorized and kept secret get c B choose k � 128 � k , M................................ �� 1024 �� c B(") k(") M,k(M),c B(B,k,s A(B,k)) MAC 148 get t A decrypt c B(B,k,s A(B,k)) test B,k with t A test M with k

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