Paper 2026/088

BLISK: Boolean circuit Logic Integrated into the Single Key

Yevhen Hrubiian, Distributed Lab

Illia Melnyk, Distributed Lab

Lasha Antadze, Rarilabs

Abstract

This paper introduces BLISK, a framework that compiles a monotone Boolean authorization policy into a single signature verification key, enabling only the authorized signer subset to produce the standard constant-size aggregated signatures. BLISK combines (1) $n$-of-$n$ multisignatures to realize conjunctions, (2) key agreement protocols to realize disjunctions, and (3) verifiable group operations (for instance, based on the 0-ART framework). BLISK avoids distributed key generation (allowing users to reuse their long-term keys), supports publicly verifiable policy compilation, and enables non-interactive key rotation.

@misc{cryptoeprint:2026/088,
      author = {Oleksandr Kurbatov and Yevhen Hrubiian and Illia Melnyk and Lasha Antadze},
      title = {{BLISK}: Boolean circuit Logic Integrated into the Single Key},
      howpublished = {Cryptology {ePrint} Archive, Paper 2026/088},
      year = {2026},
      url = {https://eprint.iacr.org/2026/088}
}