Abstract
One way to guarantee security against malicious voting servers is to use NIZK shuffle arguments. Up to now, only two NIZK shuffle arguments in the CRS model have been proposed. Both arguments are relatively inefficient compared to known random oracle based arguments. We propose a new, more efficient, shuffle argument in the CRS model. Importantly, its online prover’s computational complexity is dominated by only two \((n + 1)\)-wide multi-exponentiations, where n is the number of ciphertexts. Compared to the previously fastest argument by Lipmaa and Zhang, it satisfies a stronger notion of soundness.
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Notes
- 1.
In a practical implementation of a mix-net, one can use the random oracle model also for other purposes, such as to construct a pseudo-number generator or a public-key cryptosystem. In most of such cases, it is known how to avoid the random oracle model, although this almost always incurs some additional cost.
- 2.
A generic bilinear group adversary may learn a negligible amount of information about \(\chi \) by comparing group elements; we skip this part in the proof.
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Acknowledgments
The authors were supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement No 653497 (project PANORAMIX), and the Estonian Research Council.
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Fauzi, P., Lipmaa, H. (2016). Efficient Culpably Sound NIZK Shuffle Argument Without Random Oracles. In: Sako, K. (eds) Topics in Cryptology - CT-RSA 2016. CT-RSA 2016. Lecture Notes in Computer Science(), vol 9610. Springer, Cham. https://doi.org/10.1007/978-3-319-29485-8_12
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