International Association for Cryptologic Research

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Paper: Efficient Conversion of Secret-shared Values Between Different Fields

Authors:
Ivan Damgård
Rune Thorbek
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URL: http://eprint.iacr.org/2008/221
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Abstract: We show how to effectively convert a secret-shared bit $b$ over a prime field to another field. If initially given a random replicated secret share this conversion can be done by the cost of revealing one secret shared value. By using a pseudo-random function it is possible to convert arbitrary many bit values from one initial random replicated share. Furthermore, we generalize the conversion to handle general values of a bounded size.
BibTeX
@misc{eprint-2008-17898,
  title={Efficient Conversion of Secret-shared Values Between Different Fields},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / conversion},
  url={http://eprint.iacr.org/2008/221},
  note={ thorbek@brics.dk 14027 received 16 May 2008, last revised 28 May 2008},
  author={Ivan Damgård and Rune Thorbek},
  year=2008
}