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Open AccessArticle

Forward-Secure Linkable Ring Signatures from Bilinear Maps

1
Queensland University of Technology, Brisbane 4000, Australia
2
Polyas GmbH, 10179 Berlin, Germany
*
Author to whom correspondence should be addressed.
Cryptography 2018, 2(4), 35; https://doi.org/10.3390/cryptography2040035
Received: 14 September 2018 / Revised: 31 October 2018 / Accepted: 1 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Public Key Cryptography)
We present the first linkable ring signature scheme with both unconditional anonymity and forward-secure key update: a powerful tool which has direct applications in elegantly addressing a number of simultaneous constraints in remote electronic voting. We propose a comprehensive security model, and construct a scheme based on the hardness of finding discrete logarithms, and (for forward security) inverting bilinear or multilinear maps of moderate degree to match the time granularity of forward security. We prove efficient security reductions—which, of independent interest, apply to, and are much tighter than, linkable ring signatures without forward security, thereby vastly improving the provable security of these legacy schemes. If efficient multilinear maps should ever admit a secure realisation, our contribution would elegantly address a number of problems heretofore unsolved in the important application of (multi-election) practical Internet voting. Even if multilinear maps are never obtained, our minimal two-epoch construction instantiated from bilinear maps can be combinatorially boosted to synthesise a polynomial time granularity, which would be sufficient for Internet voting and more. View Full-Text
Keywords: linkable ring signature; bilinear map; multilinear map; electronic voting; forward security; unconditional anonymity linkable ring signature; bilinear map; multilinear map; electronic voting; forward security; unconditional anonymity
MDPI and ACS Style

Boyen, X.; Haines, T. Forward-Secure Linkable Ring Signatures from Bilinear Maps. Cryptography 2018, 2, 35.

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