Abstract
A feasible multi-party quantum private comparison (MQPC) protocol based on -dimensional Bell states was proposed. In the protocol, all participants can independently encrypt their privacies and send them to a semi-honest quantum third party (TP) through authenticated channels. Then, the TP can determine the size relationship among all participants’ privacies without gaining access to the private information. We verified correctness and effectiveness of the proposed protocol with some examples. In addition, compared with other similar protocols, it is not necessary to perform unitary operation on particles and only single-particle measurement is required. Furthermore, the relatively high qubit efficiency is promised. The security analysis verifies that the proposed protocol can counteract external and internal attacks in theory.
1 Introduction
Secure multi-party computation (SMC) was introduced by the famous Millionaires’ problem in 1982 [1], where two millionaires want to compare their wealth and learn who is wealthier without revealing their actual property. With the combination of quantum mechanics and information science, researchers have found that processing information using quantum systems has led to many striking results, such as teleportation of quantum states and quantum algorithms that are exponentially faster than their known classical counterpart. Therefore, the quantum version of SMC has once again set off a research boom. As a particular instance of quantum SMC (QSMC), quantum private comparison (QPC) has wide applications in private bidding and auctions, secret ballot elections, commercial business, identification.
Right after Yao’s millionaire problem, [2] designed an efficient and fair protocol to determine whether two millionaires are equal rich. However, as proved by [3], a quantum two-party secure computation is impossible. Therefore, a third party (e.g., a semi-honest third party) is often involved to help them achieve the task in a QSMC protocol. The semi-honest quantum third party (TP) will always follow the process of the protocol honestly. He will not prepare other types of particles (e.g., GHZ state, single photon) and conspire with any participants or outside eavesdroppers to steal the participants’ privacies. But the TP is curious to know the participants’ privacies, and try to extract their private information from he knows.
In 2009, the first QPC protocol was proposed by based on Bell states [4]. With decoy particle technology, one-way hash function and unitary operation, this protocol can compare the equality. In 2010, [5] devised a novel QPC protocol to compare the equality based on GHZ states, where the unitary operation is necessary. These early QPC protocols can only compare the equality. In 2011, a new QPC protocol was presented by [6] to compare the size relationship of privacies, where the information of size was encoded into the phase of GHZ state. In 2013, Lin et al. also designed a protocol to compare the size relationship based on the -dimensional Bell states [7]. However, the four QPC protocols mentioned above are only related to the comparison between two participants. These two-party protocols are by no means the end of the QPC research. In future secure quantum network communication, the MQPC protocol will play an important role.
Fortunately, in 2013, the first MQPC protocol was proposed based on GHZ states by [8]. Suppose there are ( ) participants, each of them has a privacy, then participants can determine whether their privacies are the same or not with the assistance of the TP. In 2014, Luo et al. devised a novel MQPC protocol based on -dimensional multi-particle entangled states [9]. In their protocol, ( ) participants’ privacies can be sorted by size with the help of the TP, and decoy particles were used to check eavesdropping. In the same year, [10] presented two MQPC protocols in distributed mode and traveling mode respectively based on multi-particle entangled states. With the assistance of the TP, the two protocols can also compare the equality of privacies for ( ) participants. Since then, various two-party [11–13] and multi-party QPC protocols have been proposed [14–17]. In 2018, Ye et al. proposed two novel multi-party quantum private comparison protocols for size relation comparison by using -level single-particle states. In 2021, Zhou et al. presented an efficient QPC protocol to compare the size relationship of privacies between two classical participants based on -dimensional Bell states. It should be noted that many previous protocols involved many kinds of operations, such as quantum measurement, unitary operation, and hash function. What’s more, some of them suffer from low qubit efficiency. Besides, only few MQPC protocols can compare the size relationship among the privacies.
To make the implementation of the protocol easier, a new MQPC protocol to compare the size relationship among many participants’ privacies is proposed. The -dimensional Bell states are taken as quantum resources and the TP is introduced to help participants to make private comparison. The rest of this paper is organized as follows: the proposed MQPC protocol based on the -dimensional Bell state is detailed in Section 2. The correctness and security are analyzed in Section 3, Section 4, respectively. The comparisons of the proposed protocol and the similar QPC protocols are made in Section 5. Finally, a short conclusion is given in Section 6.
2 The proposed MQPC protocol based on d-dimensional bell states
Assume there are participants (, , ..., ) and each participant possesses a -length privacy (if the numbers of some digits are less than , then sufficient 0s are added to their highest digit), where, , , and . In addition, there is a pre-shared key through a secure QKD protocol [18] among these participants denoted as , . Via the help of TP, they want to compare their privacies by size without revealing any private information. Next, the -dimensional Bell state will be reviewed first. Then, the detailed description of the proposed protocol will be given (Figure 1).
FIGURE 1
The schematic figure of the proposed protocol. The TP needs to implement steps 1, 4, 5 and each participant needs to implement steps 2, 3.
2.1 -dimensional bell state
Bell state, used to describe the four maximal entangled states in two-qubit system, is the most basic quantum entangled state. Compared with other quantum entangled states, Bell state is the easiest to prepare in experiment. Therefore, Bell state is widely used to design quantum cryptographic protocol. In a -dimensional Hilbert space, Bell state can be expressed as [19, 20]where ,, and denotes modulo addition. Two indistinguishable orthogonal bases Z-basis and X-basis in the -dimensional quantum system arewhere with represents quantum Fourier transform.
2.2 The proposed MQPC protocol
Step 1: According to Eq. 1, the TP randomly prepares -dimensional Bell states and they are
Based on these prepared Bell states in Eq. 3, he will record the of each state and prepare quantum sequences, namely and , which contain all the first and second particles of the EPR pairs, respectively. Each particle-sequence contains particles
To prevent eavesdropping, TP will prepare decoy particles randomly in or , and uniformly insert them into each sequence to form a new sequence . Then, sequence is sent to participant via a quantum channel, while all sequences are kept by the TP.
Step 2: After all the quantum sequences have been received by the corresponding participants, TP will announce the position and the measurement basis of each decoy particle in sequence . Then, each participant will check the security of the sequence received. Concretely, according to the announcement, each participant will use the right bases to measure these decoy particles and return the measurement results to TP. Then, the TP will verify these results and check whether eavesdroppers exist in the quantum channel. If the error rate is less than a predetermined threshold, the protocol will proceed to the next step; otherwise, the protocol will be terminated.
Step 3: After removing these decoy particles, each participant will measure the remaining particles with Z basis and record them as . Then, he (she) will compute ,
Then, Participant will obtain a sequence and send it to the TP via an authenticated channel.
Step 4: When confirming all sequences embedded privacy data have been received, TP will measure the particles in each sequence and record them as . Then, he will compute ,
Here, is the record value in Step 1 and denotes modulo subtraction.
Step 5: After TP obtaining sequence from each participant, he will finish sorting the privacies by size. The TP takes out the same digits (the -th digit) from sequences , , …, and compute ,Then, he can obtain ,For the -th elements of all participants’ privacies , , …, , the TP can deduce their size relationship easily from . that is
3 Correctness analysis
3.1 Output correctness
The quantum resource used in the protocol is the -dimensional Bell state. According to the entanglement properties of Bell state, if one measures the particle with , the -dimensional Bell state will collapse into . Therefore, the measurement results and satisfy the relationship, such that
Therefore, based on Eqs 4, 5 and 6, the Eq. 9 can be deduced
From Eq. 10, one can see that the value of indicates the size relationship between and . Therefore, according to Eqs 7, 8 the TP can obtain the size relationship among the privacies.
3.2 Examples
Here, some examples are given for illustration the presented protocol without considering the eavesdropping checking. Let and their privacies are , , , , respectively. The pre-shared key among four participants is .
Step 1: TP randomly prepares 9-dimensional Bell states,
First, he records , , , according to Eq. 11. Then, he prepares a set of sequences and sends sequence to the corresponding participant via the quantum channel.
Step 2: Suppose that no eavesdropper is detected; then, move to Step 3.
Step 3: After removing these decoy particles, Participants , , and will measure the remaining particles with Z basis and record the measurement results. If their measurement results are , , , , then the TP’s measurement results in Step 5 can be determined according to the entanglement properties of Bell state and they are
Therefore, after all participants encode their privacies according to Eq. 4, Participants , , and will obtain , , ,, separately. Then, each participant will send the encoding information to TP via an authenticated channel.
Step 4: When confirming that the encoding information from all participants has been received, the TP will measure the particles in sequence . From Step 3, one can know that the TP’s measurement results must be determined as Eq. 12. Therefore, after TP computes , he will obtain , , , .
Step 5: TP will finish sorting the privacies by size as follows
Similar to Eq. 13, the TP can obtain , . Therefore, based on Eqs 7, 8, TP can deduce the comparison results as follows
Apparently, the size relationship that TP sorts without knowing participants’ privacies is consistent with the actual data ( ) given in Section 3.2. To further clarify this process, more examples are compiled in Table 1.
TABLE 1
| Initial states | Size relationship | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ,, | 5 | 21 | 10 | 11 | 03 | 14 | 21 | 41 | 41 | 04 | 22 | 1, 1,0 | ||
| 1, 0,1 | ||||||||||||||
| ,, | 01 | 12 | 20 | 22 | 43 | 34 | 43 | 20 | 24 | 20 | 1,1,1 | |||
| 1, 1, 1 | ||||||||||||||
| ,, | 9 | 123 | 014 | 201 | 321 | 382 | 601 | 448 | 301 | 806 | 004 | 1,1,1 | ||
| ,, | 1, 1, 1 | |||||||||||||
| 1, 1, 1 | ||||||||||||||
| ,, | 401 | 432 | 210 | 372 | 616 | 064 | 885 | 251 | 386 | 112 | 0, 1, 1 | |||
| 1,1,1 | ||||||||||||||
| 1, 1, 1 | ||||||||||||||
| ,, | 7 | 103 | 201 | 312 | 314 | 240 | 616 | 423 | 453 | 233 | 012 | 1,1,1 | ||
| ,, | 0,1,1 | |||||||||||||
| ,, | 1, 1,1 | |||||||||||||
| 310 | 220 | 032 | 646 | 302 | 161 | 302 | 645 | 246 | 123 | 1, 1, 1 | ||||
| 1,1,1 | ||||||||||||||
| 0, 1, 1 |
Relation of essential indices for some examples.
4 Security analysis
Assumed that the quantum and authentical channels are the ideal channels, that’s to say, there is no noise in the channel and the particles can be sent to the receivers. In this section, the security of the proposed protocol will be analyzed from both external and internal attack. It is shown that no private information has been leaked according to the security analysis.
4.1 External attack
Eve, an external attacker, may attempt to acquire information from the participants including TP. In Step 1, Sequence is sent to the corresponding participant via the quantum channel. Eve may steal some useful information from sequences with many kinds of attacks in this step. Obviously, the security of the protocol is guaranteed by inserting the decoy particles [21, 22]. Since Eve does not know the position and the measurement basis of each decoy particle, some well-known attacks, such as intercept-resend attack, measurement-resend attack, and entanglement-measure attack can be detected with the checking mechanism [4, 23, 24]. The decoy particle technology can be thought as a variant of the eavesdropping check method of the BB84 protocol [25] which has been proven to provide unconditionally security [26]. In Step 2, the encoding information is sent to the TP via the authenticated channels. The security in this step is promised. Therefore, an external attacker cannot learn any useful information about the privacies without being detected.
4.2 Internal attack
Case 1 Internal attack from
Suppose participant
is a dishonest participant who tries to obtain other participants’ privacies in Step 1. Since
has no knowledge about the positions and the measurement bases of counterparts’ decoy particles, the attack from the participant
will be detected as an external one as described in
Section 4.1. Thus, the proposed protocol is immune to internal attack from dishonest
.
Case 2 Internal attack from TP
From Section 2.2, one can know that TP is both the sender of quantum information and the receiver of all encrypted information. Therefore, he can obtain more information than other attackers during the protocol execution. Significantly, due to TP semi-honesty, that the only thing he can do is try to extract the information from the received ciphertext . However, he is unable to learn any information about shared among these participants with a secure QKD protocol. Thus, the TP can’t obtain any useful private information from with the internal attack.
5 Discussion
In Table 2, the proposed protocol is compared with some other similar protocols with the following aspects: quantum resource used, category of QPC (size or equality), number of participants, number of TP, need for the authenticated classical channel, need for unitary operation, measurement involved, and qubit efficiency (Defined as , where is the total number of compared qubit while is the total number of qubits and classical bits used in this protocol).
TABLE 2
| Compared aspects | Reference [27] | Reference [28] | Reference [29] | Reference [30] | Our protocol |
|---|---|---|---|---|---|
| Quantum resources | D GHZ state | GHZ state | D GHZ state | GHZ state | D Bell state |
| Category of QPC | Size | Equality | Size | Equality | Size |
| Number of participants | 2 | 2 | ) | ( ) | ( ) |
| Number of TP | 1 | 1 | 1 | 2 | 1 |
| Efficiency | |||||
| Need for authenticated classical channels | No | Yes | No | Yes | Yes |
| Need for unitary operation | No | Yes | Yes | No | No |
| measurement | BM and SM | BM and SM | SM | SM | SM |
The comparisons of our QPC with other similar QPC protocols.
SM (single-particle measurement), BM (Bell measurement), D (-dimensional).
In Ref. [27], we proposed a new QPC protocol to compare the size relationship of privacies between two participants. The quantum resources used in the protocol are -dimensional GHZ states. To calculate the qubit efficiency , we must count the number of bits consumed in the transmission of information. First, TP needs ( is the length of each privacy) qubits to prepare GHZ states. Second, the participants (Alice and Bob) use qubits to send information to the TP. is the total number of compared qubit. Hence, the qubit efficiency is . It is noted that the protocol can only make private comparison between two participants. In addition, both Bell measurement and single-particle measurement are needed.
In Ref. [28], the authors presented a new QPC protocol to compare the equality of privacies between two participants. The quantum resources used are GHZ states. First, the TP needs qubits to prepare four-particle GHZ states and decoy states. Second, Alice needs qubits to send information to Bob. Third, Alice and Bob need qubits to send information to the TP. In addition, the total number of compared qubit is . Hence, the qubit efficiency is . In the protocol, both Bell measurement and single-particle measurement are involved, and unitary operation is needed.
In Ref. [29], a novel MQPC protocol for comparing the size relationship among participants’ privacies was designed. The quantum resources used are -dimensional GHZ states. First, the TP needs qubits to prepare pairs of -particle -dimensional GHZ states and decoy states. Second, each participant needs qubits to sends information to the TP. Thus, . In addition, the total number of compared bits is . Hence, the qubit efficiency is . Although the authenticated channels are not necessary in advance, quantum unitary operations have to be performed in the protocol.
In Ref. [30], the authors proposed a new MQPC protocol to compare the size relationship among participants’ privacies. The quantum resources used are -particle GHZ states. First, the TP1 needs qubits to prepare -particle GHZ states and decoy states. It is note that TP1 sends the information of the initial GHZ states to TP2 using quantum secure direct communication protocol. Second, each participant needs classical bits to send information to TP1 and TP2 via the authenticated channels. The total number of compared qubit is . Hence, the qubit efficiency is . In addition to the classic authentication channels, two TPs are required in the protocol.
In our protocol, a new MQPC protocol to compare the size relationship among participants’ privacies was proposed. The quantum resources used are -dimensional Bell states. First, the TP1 needs qubits to prepare -dimensional Bell states and decoy particles. Second, each participants need classical bits to send information to the TP via the authenticated classical channel. The total number of compared qubit is . Hence, the qubit efficiency is .
From Table 2, one can see that, like the protocols in [27, 29], our protocol can compare the size relationship among privacies, while in [28, 30] they can only compare the equality. When it comes to the MQPC, Refs. [27, 28] are useless. Compared with these protocols listed in Table 2, the unitary operation is not necessary, and only single-particle measurement is required in our protocol. Additionally, our protocol ensures the highest qubit efficiency only with the help of one TP. Table 2 clearly shows that the performance of the proposed protocol is better than these similar QPC protocols. However, it has to be said that the high dimensional quantum state is not easy to obtain experimentally at present. Therefore, we still need to work harder to realize the protocol based on the high dimensional quantum state in experiment.
6 Conclusion
Based on the -dimensional Bell states, a novel MQPC protocol is presented. With the help of a semi-honest quantum TP, our protocol can determine the size relationship among participants’ privacies without any information leakage. Since the quantum measurement and unitary operation aren’t required, it is easier to implement the proposed protocol. Furthermore, compared with the similar protocols, the qubit efficiency is increased. Decoy particles promise the security of the proposed protocol. Although it will take many efforts to move the theoretical research towards social practices, we will be very happy if this work plays a little facilitating role in further research of QSMC.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.
Author contributions
BW: Conceptualization, methodology, investigation, formal analysis, writing—original draft; L-HG: validation, writing- reviewing and editing S-QL: Conceptualization, funding acquisition, resources, supervision, writing—review and; editing.
Funding
This work is supported by the National Natural Science Foundation of China Grant No. 62161025, the Project of Scientific and Technological Innovation Base of Jiangxi Province Grant No. 20203CCD46008, and the Jiangxi Provincial Key Laboratory of Fusion and Information Control Grant No. 20171BCD40005.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Summary
Keywords
multi-party quantum private comparison, size relationship, d-dimensional bell state, qubit efficiency, semi-honest quantum third party
Citation
Wang B, Gong L-H and Liu S-Q (2022) Multi-party quantum private size comparison protocol with d-dimensional Bell states. Front. Phys. 10:981376. doi: 10.3389/fphy.2022.981376
Received
29 June 2022
Accepted
15 July 2022
Published
22 August 2022
Volume
10 - 2022
Edited by
Tianyu Ye, Zhejiang Gongshang University, China
Reviewed by
Run-hua Shi, North China Electric Power University, China
Mingxing Luo, Southwest Jiaotong University, China
Yuling Chen, Guizhou University, China
Updates
Copyright
© 2022 Wang, Gong and Liu.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: San-Qiu Liu, sqlgroup@ncu.edu.cn
This article was submitted to Quantum Engineering and Technology, a section of the journal Frontiers in Physics
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.