Collaboration Encouraging Quantum Secret Sharing Scheme with Seal Property

TL;DR

This paper introduces a novel quantum secret sharing scheme that encourages participant collaboration and includes a seal property allowing the dealer to revoke the secret before a certain time, with both unconditional and computationally secure constructions.

Contribution

It presents the first collaboration-encouraging quantum secret sharing scheme with a seal property, including optimal and post-quantum secure implementations.

Findings

Unconditional secure scheme achieving optimal seal bound.

Post-quantum secure scheme improves seal bound.

Scheme encourages participant collaboration.

Abstract

A new concept of quantum secret sharing is introduced, in which collaboration among participants are encourage. And the dealer can ask the participants to send back their share and revoke the secret before a predefined date or event, i.e. so-called seal property. We also give two concrete constructions of CE-QSS-Seal (Collaboration-Encouraging Quantum Secret Sharing with Seal property) scheme. The first one is unconditional secure and achieve the optimal bound of a seal scheme. The second one improve the optimal bound of seal by introducing post-quantum secure computational assumption.