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Semi-quantum Key Agreement Protocol against Dishonest Third-party with Delegating Quantum Measuring

Yi‐Hua Zhou, Yang Xu, Yu‐Guang Yang, Wei‐Min Shi, Ze-Song Chen

Published Aug 29, 2022• 1 citation
Publisher

Abstract

Abstract In quantum cloud environment, most application protocols have the problems of using a lot of quantum resources, high communication costs, and inability to check the honesty of cloud server. Therefore, a semi-quantum key agreement protocol based on GHZ-like state with a dishonest delegated measuring center is proposed. In our protocol, the application system consists of a quantum cloud server which only needs to prepare GHZ-like states and distributes all the particles to other participants, a quantum measuring center which performs complicated quantum measurement, such as X-base measurement and Bell measurement, and many classical semi-quantum participants which perform key agreement. Our protocol has many advantages. First, our protocol removes the assumption of honest or semi-honest cloud server because the dishonesty of cloud sever can be checked by delegated measuring center and classical semi-quantum participants. Second, the dishonesty of measuring center can also be found by classical semi-quantum participants through joint measurement. Third, only classical semi-quantum participants can obtain random shared key even if quantum cloud server and measuring center are interested in shared keys. Fourth, a large number of participants may be semi-quantum users which saving a lot of quantum resources. Our protocol is especially suitable for applications such as a large number of classical users arbitrarily performing key agreement in a real cloud environment which only need fewer resources, being easy to implement, and controllable. Security analysis and efficiency analysis show that our protocol can not only effectively resist external and internal attacks, but also resist collusion attack, which is more efficient than similar protocols.

DOI
10.21203/rs.3.rs-1539779/v2

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Abstract In quantum cloud environment, most application protocols have the problems of using a lot of quantum resources, high communication costs, and inability to check the honesty of cloud server. Therefore, a semi-quantum key agreement protocol based on GHZ-like state with a dishonest delegated measuring center is proposed. In our protocol, the application system consists of a quantum cloud server which only needs to prepare GHZ-like states and distributes all the particles to other participants, a quantum measuring center which performs complicated quantum measurement, such as X-base measurement and Bell measurement, and many classical semi-quantum participants which perform key agreement. Our protocol has many advantages. First, our protocol removes the assumption of honest or semi-honest cloud server because the dishonesty of cloud sever can be checked by delegated measuring center and classical semi-quantum participants. Second, the dishonesty of measuring center can also be found by classical semi-quantum participants through joint measurement. Third, only classical semi-quantum participants can obtain random shared key even if quantum cloud server and measuring center are interested in shared keys. Fourth, a large number of participants may be semi-quantum users which saving a lot of quantum resources. Our protocol is especially suitable for applications such as a large number of classical users arbitrarily performing key agreement in a real cloud environment which only need fewer resources, being easy to implement, and controllable. Security analysis and efficiency analysis show that our protocol can not only effectively resist external and internal attacks, but also resist collusion attack, which is more efficient than similar protocols.
Abstract In quantum cloud environment, most application protocols have the problems of using a lot of quantum resources, high communication costs, and inability to check the honesty of cloud server. Therefore, a semi-quantum key agreement protocol based on GHZ-like state with a dishonest delegated measuring center is proposed. In our protocol, the application system consists of a quantum cloud server which only needs to prepare GHZ-like states and distributes all the particles to other participants, a quantum measuring center which performs complicated quantum measurement, such as X-base measurement and Bell measurement, and many classical semi-quantum participants which perform key agreement. Our protocol has many advantages. First, our protocol removes the assumption of honest or semi-honest cloud server because the dishonesty of cloud sever can be checked by delegated measuring center and classical semi-quantum participants. Second, the dishonesty of measuring center can also be found by classical semi-quantum participants through joint measurement. Third, only classical semi-quantum participants can obtain random shared key even if quantum cloud server and measuring center are interested in shared keys. Fourth, a large number of participants may be semi-quantum users which saving a lot of quantum resources. Our protocol is especially suitable for applications such as a large number of classical users arbitrarily performing key agreement in a real cloud environment which only need fewer resources, being easy to implement, and controllable. Security analysis and efficiency analysis show that our protocol can not only effectively resist external and internal attacks, but also resist collusion attack, which is more efficient than similar protocols.
Abstract The semi-quantum key agreement (SQKA) protocol enables classical participants to complete key agreement with limited quantum capabilities. The previous semi-quantum key agreement protocols required the classical party to have the ability to measure qubits, and share a key before the protocol began. This paper proposes a SQKA protocol that allows semi-quantum participants to use single photons for key negotiation with the help of a semi-honest third party (TP). Unlike previous approaches, this protocol further reduces the quantum capability requirements for participants and eliminates the need for prior key sharing. Furthermore, through security analysis and multi-party expansion, the protocol can resist external attacks such as the intercept-resend attack, measure-resend attack, entangle-measure attack. Additionally, it can be applied to scenarios involving different numbers of participants.
Abstract The semi-quantum key agreement (SQKA) is a combination of the ‘semi-quantum’ concept in the quantum key agreement (QKA), which aims to reduce the requirements on the quantum ability of the participants while maintaining the security of the key agreement. In this paper, two novel two-party SQKA protocols based on seven-particle entangled states and delegated quantum centers in the collective noise channels are proposed. In the two SQKA protocols, only the quantum center possesses full quantum capabilities, while other participants have only partial quantum abilities. The classical party, on the other hand, only needs to perform Z-basis measurement on the classical basis. Due to the properties of entangled states, the two SQKA protocols can resist internal and external attacks. Furthermore, this paper provides a comprehensive analysis of the security of the proposed protocols, illustrating their resilience against various forms of attacks such as eavesdropping, intercept-resend attacks, and entangle-measure attacks. The results indicate that both protocols perform well in collective noise channels while maintaining high security even under noisy conditions. Moreover, eavesdropping simulation can detect whether there is eavesdropping behavior in the communication process. Finally, a comparison with existing protocols shows that the two proposed protocols exhibit higher qubit efficiency.
Abstract:In order to solve the problem that the multi-particle joint measurements are difficult to implement with the existing technology in the quantum key agreement protocols based on multi-particle entangled states , a new two-party quantum key agreement protocol was proposed based on three-particle GHZ states. Two participants in the protocol could fairly establish a shared secret key by using the measurement correlation property of three-particle GHZ states and the delayed measurement technique. Since the new protocol only used Bell measurements and single particle measurements, it was easy to achieve on the basis of the existing technology. The security analysis showed that the protocol could not only resist against participant attacks and outsider attacks, but also resist against two kinds of Trojan horse attacks. The protocol was secure not only in the noise-free quantum channel but also in the quantum noise channel. Finally, the comparison with the existed secure two-party protocols showed that the protocol also achieved higher qubit efficiency.
Quantum key agreement (QKA) can generate a shared secret key which is equally negotiated by all the participants in the protocol. In most of the QKA protocols, all the participants require quantum capabilities. But the quantum devices are too expensive for participants. This paper proposes a mutual semi-quantum key agreement protocol which allows two parties (Alice and Bob) to negotiate a shared secret key equally. In the protocol, Alice can perform any quantum operation, but Bob is a classical participant which can only perform reflection, measurement and reorder operation. Even though Bob has fewer quantum resources, Alice and Bob have an equal contribution to the shared final key, no one can determine the shared key alone. In addition, we demonstrate the security of the proposed protocol. The analysis results show that the proposed protocol not only resists against some common attacks but also assures the fairness property. It is significant for communication participant without enough quantum devices to achieve quantum communication. The proposed protocol can be implemented with present quantum technologies.
In order to reduce the cost of quantum devices and perform quantum computing better,a multiparty semi-quantum key agreement protocol based on delegating quantum computation mode is proposed.Delegating quantum computation model is introduced.The complicated operations such as unitary operation and Bell measurement are entrusted to the quantum center.Participants only need the simple ability of accessing quantum channel and preparing single photons.In order to prevent key information from being stolen by quantum center or outside attackers,the confusion strategy of inserting confusion single photons into target states is used to keep target states safe.Analysis results show that compared with previously quantum key agreement protocols,the quantum capabilities required by the participants significantly decrease,thus improving the practical feasibility of the protocol.