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Lattice-Based Simulatable
VRFs: Challenges and Future Directions Chalmers University of Technology,
Gothenburg, Sweden {brunetta, lbei, aikmitr}@chalmers.se
Abstract Lattice-based cryptography is evolving rapidly and is often employed to design cryptographic primitives that hold a great promise to be post-quantum resistant and can be employed in multiple application settings such as: e-cash, unique digital signatures, non-interactive lottery and others. In such application scenarios, a user is often required to prove non-interactively the correct computation of a pseudo-random function Fk(x) without revealing the secret key k used. Commitment schemes are also useful in application settings requiring to commit to a chosen but secret value that could be revealed later. In this short paper, we provide our insights on constructing a lattice-based simulatable verifiable random function (sVRF) using non interactive zero knowledge arguments and dual-mode commitment schemes and we point out the main challenges that need to be addressed in order to achieve it. Keywords: Dual-Mode
Commitment Scheme, Lattice-based Cryptography, Pseudo Random Functions, +: Corresponding author: Carlo Brunetta Journal of Internet Services and Information
Security (JISIS), 8(4): 57-69,
November 2018 |