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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Information-theoretically secure encryption (1) “Any ciphertext S may equally well be any plaintext x” ciphertext S 00 01 10 11 key k secure cipher plaintext x 00 01 10 11 ciphertext S 00 01 10 11 key k insecure cipher plaintext x 00 01 10 11 149

Information-theoretically secure encryption (2) “Any ciphertext S may equally well be any plaintext x” ciphertext S 00 01 10 11 key example : Vernam cipher mod 2 x = 00 01 00 10 � k = 10 11 01 00 S = 10 10 01 10 k plaintext x ciphertext 00 0 01 01 secure cipher 00 10 11 S 00 10 11 key k insecure cipher subtraction of one key bit mod 4 from 2 plaintext bits plaintext x 00 01 10 11 150

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