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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

ciphertext S 00 01 10 11

ciphertext S 00 01 10 11 equally distributed Information-theoretically secure encryption (3) Different probability distributions – how do they fit? key k secure cipher equally distributed plaintext x 00 01 10 11 unevenly distributed Unevenly distributed plaintexts enciphered with equally distributed keys yield equally distributed ciphertexts. 151

ciphertext S 00 01 10 11 equally distributed Information-theoretically secure encryption (4) Different probability distributions – how do they fit? key k secure cipher equally distribu- ted, but not independently of the ciphertexts plaintext x 00 01 10 11 unevenly distributed Equally distributed ciphertexts deciphered with equally distributed keys can yield unevenly distributed plaintexts, iff ciphertexts and keys are not independently distributed, i.e., the ciphertexts have been calculated using the plaintext and the key. 152

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X - Technische Universität Dresden
X - Technische Universität Dresden
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