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• W2167236842 abstract "We propose a simple and general framework for constructing oblivious transfer (OT) protocols that are efficient, universally composable, and generally realizable under any one of a variety of standard number-theoretic assumptions, including the decisional Diffie-Hellman assumption, the quadratic residuosity and decisional composite residuosity assumptions, and worst-case lattice assumptions.Our OT protocols are round-optimal (one message each way), quite efficient in computation and communication, and can use a single common string for an unbounded number of executions between the same sender and receiver. Furthermore, the protocols can provide statistical security to either the sender or the receiver, simply by changing the distribution of the common string. For certain instantiations of the protocol, even a common uniformly random string suffices.Our key technical contribution is a simple abstraction that we call a dual-mode cryptosystem. We implement dual-mode cryptosystems by taking a unified view of several cryptosystems that have what we call “messy” public keys, whose defining property is that a ciphertext encrypted under such a key carries no information (statistically) about the encrypted message.As a contribution of independent interest, we also provide a multi-bit amortized version of Regev’s lattice-based cryptosystem (STOC 2005) whose time and space complexity are improved by a linear factor in the security parameter n. The resulting amortized encryption and decryption times are only (tilde{O}(n)) bit operations per message bit, and the ciphertext expansion can be made as small as a constant; the public key size and underlying lattice assumption remain essentially the same." @default.
• W2167236842 created "2016-06-24" @default.
• W2167236842 creator A5000240220 @default.
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• W2167236842 date "2008-08-20" @default.
• W2167236842 modified "2023-10-09" @default.
• W2167236842 title "A Framework for Efficient and Composable Oblivious Transfer" @default.
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• W2167236842 doi "https://doi.org/10.1007/978-3-540-85174-5_31" @default.
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