Abstract
Recently, motivated by its increased use in real-world applications, there has been a growing interest on the reduction of trust in the generation of the common reference string (CRS) for zero-knowledge (ZK) proofs. This line of research was initiated by the introduction of subversion non-interactive ZK (NIZK) proofs by Bellare et al. (ASIACRYPT’16). Here, the zero-knowledge property needs to hold even in case of a malicious generation of the CRS. Groth et al. (CRYPTO’18) then introduced the notion of updatable zk-SNARKS, later adopted by Lipmaa (SCN’20) to updatable quasi-adaptive NIZK (QA-NIZK) proofs. In contrast to the subversion setting, in the updatable setting one can achieve stronger soundness guarantees at the cost of reintroducing some trust, resulting in a model in between the fully trusted CRS generation and the subversion setting. It is a promising concept, but all previous updatable constructions are ad-hoc and tailored to particular instances of proof systems. Consequently, it is an interesting question whether it is possible to construct updatable ZK primitives in a more modular way from simpler building blocks.
In this work we revisit the notion of trapdoor smooth projective hash functions (TSPHFs) in the light of an updatable CRS. TSPHFs have been introduced by Benhamouda et al. (CRYPTO’13) and can be seen as a special type of a 2-round ZK proof system. In doing so, we first present a framework called lighter TSPHFs (L-TSPHFs). Building upon it, we introduce updatable L-TSPHFs as well as instantiations in bilinear groups. We then show how one can generically construct updatable quasi-adaptive zero-knowledge arguments from updatable L-TSPHFs. Our instantiations are generic and more efficient than existing ones. Finally, we discuss applications of (updatable) L-TSPHFs to efficient (updatable) 2-round ZK arguments as well as updatable password-authenticated key-exchange (uPAKE).
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Notes
- 1.
HAK is essentially a concrete Algebraic Group Model (AGM) [24] version of the generic group model with hashing that models the ability of an adversary to create elliptic-curve group elements by using elliptic-curve hashing without knowing their discrete logarithm.
- 2.
We note that all ZK arguments we consider in this paper are in the quasi-adaptive setting and we might sometimes omit to make this explicit.
- 3.
We note that in the SPHF/TSPHF and their applications in zero-knowledge proofs, one wants to simulate a proof without knowing the trapdoor \(\mathbf {\Gamma }\) of the base elements of the statement to be proven.
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Acknowledgements
This work received funding from European Union’s Horizon 2020 ECSEL Joint Undertaking project under grant agreement 783119 (Secredas), from the European Union’s Horizon 2020 research and innovation programme under grant agreement 871473 (Kraken) and by the Austrian Science Fund (FWF) and netidee SCIENCE under grant agreement P31621-N38 (Profet).
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Abdolmaleki, B., Slamanig, D. (2021). Updatable Trapdoor SPHFs: Modular Construction of Updatable Zero-Knowledge Arguments and More. In: Baek, J., Ruj, S. (eds) Information Security and Privacy. ACISP 2021. Lecture Notes in Computer Science(), vol 13083. Springer, Cham. https://doi.org/10.1007/978-3-030-90567-5_3
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