Cloud-assisted quantum primitive protocols and applications

Security and privacy have always been key concerns for individuals in various cloud-assisted services. In order to enhance security, we focus on quantum cryptography in novel cloud-based applications. First, we present two quantum primitive protocols to compute XOR of two private bits and AND of two private bits with the assistance of a quantum cloud, respectively. Then, we generalize two-party protocols to the corresponding multi-party cases. These quantum primitive protocols can ensure information-theoretical security and provide long-term security, which are guaranteed by the principles of quantum mechanics. Furthermore, we present a grouping strategy to improve the communication efficiency of multiparty quantum protocols. In addition, we investigate privacy-preserving applications of these quantum primitive protocols in cloud-based environments, e.g., cloud-based Anonymous Voting and Multiparty Private Set Intersection. Finally, simulated experiments show our proposed quantum protocols are correct and feasible with the present quantum technology.