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- W1493988823 abstract "Roughly speaking, an encryption scheme is said to be nonmalleable, if no adversary can modify a ciphertext so that the resulting message is meaningfully related to the original message. We compare this notion of security to secrecy and authenticity, and provide a complete characterization of their relative strengths. In particular, we show that information-theoretic perfect non-malleability is equivalent to perfect secrecy of two different messages. This implies that for n-bit messages a shared secret key of length roughly 2n is necessary to achieve non-malleability, which meets the previously known upper bound. We define approximate non-malleability by relaxing the security conditions and only requiring non-malleability to hold with high probability (over the choice of secret key), and show that any authentication scheme implies approximate non-malleability. Since authentication is possible with a shared secret key of length roughly log n, the same applies to approximate non-malleability." @default.
- W1493988823 created "2016-06-24" @default.
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- W1493988823 date "2011-01-01" @default.
- W1493988823 modified "2023-09-25" @default.
- W1493988823 title "Characterization of the Relations between Information-Theoretic Non-malleability, Secrecy, and Authenticity" @default.
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- W1493988823 doi "https://doi.org/10.1007/978-3-642-20728-0_2" @default.
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