Valiant's Universal Circuit is Practical

Universal circuits (UCs) can be programmed to evaluate any circuit of a given size k. They provide elegant solutions in various application scenarios, e.g. for private function evaluation (PFE) and for improving the flexibility of attribute-based encryption (ABE) schemes. The optimal size of a universal circuit is proven to be Ω(k log k). Valiant (STOC’76) proposed a size-optimized UC construction, which has not been put in practice ever since. The only implementation of universal circuits was provided by Kolesnikov and Schneider (FC’08), with size O(k log2 k). In this paper, we refine the size of Valiant’s UC and further improve the construction by (at least) 2k. We show that due to recent optimizations and our improvements, it is the best solution to apply in the case for circuits with a constant number of inputs and outputs. When the number of inputs or outputs is linear in the number of gates, we propose a more efficient hybrid solution based on the two existing construct...

• Type: Journal
• Year: 2016
• Where: IACR
• Authors: Ágnes Kiss, Thomas Schneider 0003
• Keywords: Biometrics, IACR 2016