Asymmetric Quantum Secure Multi-Party Computation With Weak Clients Against Dishonest Majority

Theodoros Kapourniotis; Elham Kashefi; Dominik Leichtle; Luka Music; Harold Ollivier

Paper 2023/379

Asymmetric Quantum Secure Multi-Party Computation With Weak Clients Against Dishonest Majority

Theodoros Kapourniotis

, University of Warwick

Elham Kashefi, Sorbonne University, University of Edinburgh

Dominik Leichtle

, Sorbonne University

Luka Music

, Quandela

Harold Ollivier, French Institute for Research in Computer Science and Automation

Abstract

Secure multi-party computation (SMPC) protocols allow several parties that distrust each other to collectively compute a function on their inputs. In this paper, we introduce a protocol that lifts classical SMPC to quantum SMPC in a composably and statistically secure way, even for a single honest party. Unlike previous quantum SMPC protocols, our proposal only requires very limited quantum resources from all but one party; it suffices that the weak parties, i.e. the clients, are able to prepare single-qubit states in the X-Y plane. The novel quantum SMPC protocol is constructed in a naturally modular way, and relies on a new technique for quantum verification that is of independent interest. This verification technique requires the remote preparation of states only in a single plane of the Bloch sphere. In the course of proving the security of the new verification protocol, we also uncover a fundamental invariance that is inherent to measurement-based quantum computing.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint.
Keywords: Quantum Verification Delegated Computation Secure Multi-Party Computation Distributed Quantum Computing
Contact author(s): t kapourniotis @ warwick ac uk
ekashefi @ inf ed ac uk
dominik leichtle @ lip6 fr
luka music @ quandela com
harold ollivier @ inria fr
History: 2023-03-16: approved; 2023-03-15: received; See all versions
Short URL: https://ia.cr/2023/379
License: CC BY-NC-SA

BibTeX

@misc{cryptoeprint:2023/379,
      author = {Theodoros Kapourniotis and Elham Kashefi and Dominik Leichtle and Luka Music and Harold Ollivier},
      title = {Asymmetric Quantum Secure Multi-Party Computation With Weak Clients Against Dishonest Majority},
      howpublished = {Cryptology {ePrint} Archive, Paper 2023/379},
      year = {2023},
      url = {https://eprint.iacr.org/2023/379}
}