Phase-Based Bit Commitment Protocol

TL;DR

This paper introduces a quantum optical bit commitment protocol that relies on the assumption of secure transmission lines, providing a foundation for privacy-preserving computations in AI and machine learning applications.

Contribution

It presents a novel quantum optical bit commitment protocol with security proofs under the assumption of secure transmission lines against eavesdropping.

Findings

Protocol is secure under honest but curious model.

Security depends on the assumption of secure transmission lines.

Discusses the hardness of Mayer's attack against the protocol.

Abstract

With the rise of artificial intelligence and machine learning, a new wave of private information is being flushed into applications. This development raises privacy concerns, as private datasets can be stolen or abused for non-authorized purposes. Secure function computation aims to solve such problems by allowing a service provider to compute functions of datasets in the possession of a a data provider without reading the data itself. A foundational primitive for such tasks is Bit Commitment (BC), which is known to be impossible to realize without added assumptions. Given the pressing nature of the topic, it is thus important to develop BC systems and prove their security under reasonable assumptions. In this work, we provide a novel quantum optical BC protocol that uses the added assumption that the network provider will secure transmission lines against eavesdropping. Under this added assumption, we prove security of our protocol in the honest but curious setting and discuss the hardness of Mayer's attack in the context of our protocol.