Welcome to the resource topic for 2007/133
Title:
New Communication-Efficient Oblivious Transfer Protocols Based on Pairings
Authors: Helger Lipmaa
Abstract:We construct two simple families of two-message (n,1)-oblivious transfer protocols based on degree-t homomorphic cryptosystems with the communication of respectively 1+\lceil n/t \rceil and 3+\lceil n/(t+1) \rceil ciphertexts. The construction of both families relies on efficient cryptocomputable conditional disclosure of secret protocols; the way this is done may be of independent interest. The currently most interesting case t=2 can be based on the Boneh-Goh-Nissim cryptosystem. As an important application, we show how to reduce the communication of virtually any existing oblivious transfer protocols by proposing a new related communication-efficient generic transformation from computationally-private information retrieval protocols to oblivious transfer protocols.
ePrint: https://eprint.iacr.org/2007/133
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