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A Black-Box Construction of Non-malleable Encryption from Semantically Secure Encryption
<span title="2017-03-13">2017</span>
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<a target="_blank" rel="noopener" href="https://fatcat.wiki/container/7jmi32x7o5hfnpkgh2irnuqpim" style="color: black;">Journal of Cryptology</a>
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We show how to transform any semantically secure encryption scheme into a non-malleable one, with a black-box construction that achieves a quasi-linear blow-up in the size of the ciphertext. This improves upon the previous non-black-box construction of Pass, Shelat and Vaikuntanathan (Crypto '06). Our construction also extends readily to guarantee nonmalleability under a bounded-CCA2 attack, thereby simultaneously improving on both results in the work of Cramer et al. (Asiacrypt '07). Our
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... uction departs from the oft-used paradigm of re-encrypting the same message with different keys and then proving consistency of encryption. Instead, we encrypt an encoding of the message; the encoding is based on an error-correcting code with certain properties of reconstruction and secrecy from partial views, satisfied, e.g., by a Reed-Solomon code.
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