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CHQS: Publicly Verifiable Homomorphic Signatures Beyond the Linear Case

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Information Security Practice and Experience (ISPEC 2018)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 11125))

Abstract

Sensitive data is often outsourced to cloud servers, with the server performing computation on the data. Computational correctness must be efficiently verifiable by a third party while the input data remains confidential. We introduce CHQS, a homomorphic signature scheme from bilinear groups fulfilling these requirements. CHQS is the first such scheme to be both context hiding and publicly verifiable for arithmetic circuits of degree 2. It also achieves amortized efficiency: after a precomputation, verification can be faster than the circuit evaluation itself.

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Acknowledgment

This work has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No 644962.

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Authors and Affiliations

  1. Technische Universität Darmstadt, Darmstadt, Germany

    Lucas Schabhüser, Denis Butin & Johannes Buchmann

Authors
  1. Lucas Schabhüser
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  2. Denis Butin
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  3. Johannes Buchmann
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Corresponding author

Correspondence to Lucas Schabhüser .

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Editors and Affiliations

  1. University of Aizu, Aizuwakamatsu, Japan

    Chunhua Su

  2. Meiji University, Tokyo, Japan

    Hiroaki Kikuchi

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Schabhüser, L., Butin, D., Buchmann, J. (2018). CHQS: Publicly Verifiable Homomorphic Signatures Beyond the Linear Case. In: Su, C., Kikuchi, H. (eds) Information Security Practice and Experience. ISPEC 2018. Lecture Notes in Computer Science(), vol 11125. Springer, Cham. https://doi.org/10.1007/978-3-319-99807-7_13

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  • DOI: https://doi.org/10.1007/978-3-319-99807-7_13

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