In this paper, a quantum private comparison protocol is proposed based on bell entangled states. In our protocol, two parties can compare the equality of their information with the help of a semi-honest third party. The correctness and security of our protocol are discussed. One party cannot learn the other's private information and the third party also cannot learn any information about the private information.
In this paper, a quantum private comparison protocol is proposed based on bell entangled states. In our protocol, two parties can compare the equality of their information with the help of a semi-honest third party. The correctness and security of our protocol are discussed. One party cannot learn the other's private information and the third party also cannot learn any information about the private information.
In this paper, a novel semiquantum private comparison (SQPC) protocol based on single kind of Bell entangled states is proposed, which allows two classical parties to judge the equality of their private inputs securely and correctly under the help of a semi-honest third party (TP) who possesses complete quantum capabilities. TP is allowed to misbehave on her own but cannot conspire with anyone else. Our protocol does not need to share secret keys among different participants in advance, and needs neither unitary operations nor quantum entanglement swapping. Moreover, our protocol only needs to prepare single kind of Bell entangled states as initial quantum resource. Detailed security analysis turns out that our protocol is secure against various outside and participant attacks. Compared with most of the existing SQPC protocols based on Bell entangled states, our protocol is more feasible in practice.
Private comparison is the basis of many encryption technologies, and several related Quantum Private Comparison (QPC) protocols have been published in recent years. In these existing protocols, secret information is encoded by using conjugate coding or orthogonal states, and all users are quantum participants. In this paper, a novel semi-quantum private comparison scheme is proposed, which employs Bell entangled states as quantum resources. Two semi-quantum participants compare the equivalence of their private information with the help of a semi-honest third party (TP). Compared with the previous classical protocols, these two semi-quantum users can only make some particular action, such as to measure, prepare and reflect quantum qubits only in the classical basis {|0⟩,|1⟩} , and TP needs to perform Bell basis measurement on reflecting qubits to obtain the results of the comparison. Further, analysis results show that this scheme can avoid outside and participant attacks and its’ qubit efficiency is better than the other two protocols mentioned in the paper.
Abstract In this paper, a novel semiquantum private comparison (SQPC) protocol based on single kind of Bell states is proposed, which allows two classical parties to judge the equality of their private inputs securely and correctly under the help of a semi-honest third party (TP) who possesses complete quantum capabilities. TP is allowed to misbehave on her own but cannot conspire with anyone else. Our protocol needs none of unitary operations, quantum entanglement swapping or the reordering operations. Moreover, our protocol only needs to prepare single kind of Bell states as initial quantum resource. Detailed security analysis turns out that our protocol is secure against various outside and participant attacks. Compared with most of the existing SQPC protocols based on Bell states, our protocol is more feasible in practice.
Abstract Based on Bell states, a new semi-quantum private comparison protocol is proposed that enables two classical users to securely compare the equality of their private information with the aid of a semi-honest third party. Different from the existing semi-quantum private comparison protocols, the two classical participants in the presented protocol do not need to measure and prepare any quantum state, which not only reduces the consumption of quantum devices, but also greatly improves the feasibility of the protocol. Performing different unitary operations on the received particles, classical users can securely compare their secret information. Besides, the devised protocol has higher qubit efficiency than the other similar counterparts, since participants can compare a two-bit privacy each time with one qubit. Meanwhile, after completing the comparison process, all Bell states could be reused since they still retain the corresponding entanglement property, which greatly facilitates the recycle of quantum resources. Security analyses indicate that the designed scheme is secure against external attack and internal attack. Moreover, the operations involved in our scheme are simulated on the IBM Quantum Experience to demonstrate the effectiveness and security of our scheme.
In this paper,a quantum private comparison protocol based on d dimensional single-particle states is proposed. In the protocol,a semi-honest third party transfers a sequence of n particles to one participant w ho encodes n secret keys by performing n local unitary operations. Then these particles are sent to the other participant w ho also by the same w ay encodes n secret keys and returns these particles back to the semi-honest party. Finally after the participants broadcast the results of encrypting their secrets w ith secret keys,the semi-honest third party can help the tw o participants compare the size relationships of their n pair corresponding secrets w ithout disclosing them to any other people. In addition,the security of the protocol is also discussed in detail. It is show n that the protocol is secure in theory. Moreover,since only single-particle states are used,as compared w ith other quantum private comparison protocols,the presented protocol is more feasible under the current technical conditions.
Using the highly entangled six-qubit genuine state we present a quantum private comparison(QPC)protocol, which enables two users to compare the equality of two bits of their secrets in every round comparison with the assistance of a semi-honest third party(TP). The proposed protocol needs neither unitary operations nor quantum entanglement swapping technology, both of which may consume expensive quantum devices. Single particle measurements and Bell-basis measurements, which are easy to implement with current technologies, are employed by two users and TP in the proposed protocol, respectively. The proposed protocol can withstand all kinds of outside attacks and participant attacks. Moreover, none of information about the two users’ private secrets and the comparison result is leaked out to TP.