Abstract
We present a general framework for efficient, universally composable oblivious transfer (OT) protocols in which a single, global, common reference string (CRS) can be used for multiple invocations of oblivious transfer by arbitrary pairs of parties. In addition:
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Our framework is round-efficient. E.g., under the DLIN or SXDH assumptions we achieve round-optimal protocols with static security, or 3-round protocols with adaptive security (assuming erasure).
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Our resulting protocols are more efficient than any known previously, and in particular yield protocols for string OT using O(1) exponentiations and communicating O(1) group elements.
Our result improves on that of Peikert et al. (Crypto 2008), which uses a CRS whose length depends on the number of parties in the network and achieves only static security. Compared to Garay et al. (Crypto 2009), we achieve adaptive security with better round complexity and efficiency.
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Choi, S.G., Katz, J., Wee, H., Zhou, HS. (2013). Efficient, Adaptively Secure, and Composable Oblivious Transfer with a Single, Global CRS. In: Kurosawa, K., Hanaoka, G. (eds) Public-Key Cryptography – PKC 2013. PKC 2013. Lecture Notes in Computer Science, vol 7778. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36362-7_6
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