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Fair Exchange of Short Signatures without Trusted Third Party

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Topics in Cryptology – CT-RSA 2013 (CT-RSA 2013)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 7779))

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Abstract

We propose a protocol to exchange Boneh-Boyen short signatures in a fair way and without relying on a trusted third party. Our protocol is quite practical and is the first of the sort to the best of our knowledge. Our construction uses a new non-interactive zero-knowledge (NIZK) argument to prove that a commitment is the encryption of a bit vector. We also design a NIZK argument to prove that a commitment to a bit vector v = (b 1,b 2,...,b κ ) is such that ∑  i ∈ [κ] b i 2i − 1 = θ where θ is the discrete logarithm of some public value D = g θ. These arguments may be of independent interest.

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Authors and Affiliations

  1. Dept. of Computer Science, University of Chile, Blanco Encalada 2120, 4to piso, Santiago, Chile

    Philippe Camacho

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  1. Philippe Camacho
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Editors and Affiliations

  1. Institute for Future Enviroments, Queensland University of Technology, GPO Box 2434, 4000, Brisbane, QLD, Australia

    Ed Dawson

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Camacho, P. (2013). Fair Exchange of Short Signatures without Trusted Third Party. In: Dawson, E. (eds) Topics in Cryptology – CT-RSA 2013. CT-RSA 2013. Lecture Notes in Computer Science, vol 7779. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36095-4_3

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  • DOI: https://doi.org/10.1007/978-3-642-36095-4_3

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-36094-7

  • Online ISBN: 978-3-642-36095-4

  • eBook Packages: Computer ScienceComputer Science (R0)

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