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2008

Essentially Optimal Universally Composable Oblivious Transfer

11 years 6 months ago
Essentially Optimal Universally Composable Oblivious Transfer
Oblivious transfer is one of the most important cryptographic primitives, both for theoretical and practical reasons and several protocols were proposed during the years. We provide the first oblivious transfer protocol which is simultaneously optimal on the following list of parameters: Security: it has universal composition. Trust in setup assumptions: only one of the parties needs to trust the setup (and some setup is needed for UC security). Trust in computational assumptions: only one of the parties needs to trust a computational assumption. Round complexity: it uses only two rounds. Communication complexity: it communicates O(1) group elements to transfer one out of two group elements. The Big-O notation hides 32, meaning that the communication is probably not optimal, but is essentially optimal in that the overhead is at least constant. Our construction is based on pairings, and we assume the presence of a key registration authority. Key words: Oblivious Transfer, Universally Co...
Ivan Damgård, Jesper Buus Nielsen, Claudio O
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2008
Where ICISC
Authors Ivan Damgård, Jesper Buus Nielsen, Claudio Orlandi
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