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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Stream cipher

Stream cipher synchronous self synchronizing Cipher Block cipher Modes of operation: Simplest: ECB (electronic codebook) each block separately But: concealment: block patterns identifiable authentication: blocks permutable 234

e.g. 64 bits with DES ECB Main problem of ECB block borders ECB same plaintext blocks same ciphertext blocks Telefax example (� compression is helpful) 235 plaintext blocks ciphertext blocks

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