Oblivious Transfer Is Symmetric

@article{Wolf2004ObliviousTI,
  title={Oblivious Transfer Is Symmetric},
  author={Stefan Wolf and J{\"u}rg Wullschleger},
  journal={IACR Cryptology ePrint Archive},
  year={2004},
  volume={2004},
  pages={336}
}
We show that oblivious transfer of bits from A to B can be obtained from a single instance of the same primitive from B to A. Our reduction is perfect and shows that oblivious transfer is in fact a symmetric functionality. This solves an open problem posed by Crépeau and Sántha in 1991. 
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