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Journal of Physics Conference Series

The attack strategy for a quantum key distribution protocol based on Bell’s theorem

Chan Myae Hein, T. F. Kamalov

Published Oct 1, 2021• 0 citations
Publisher

Abstract

Abstract A new eavesdropping strategy is proposed for the Quantum Key Distribution (QKD) protocol. This scheme represents a new kind of intercept/resend strategy based on Bell’s theorem. Quantum key distribution (QKD) provides the foremost reliable form of secure key exchange, using only the input-output statistics of the devices to realize information-theoretic security. In this paper, we present an improved QKD protocol that can simultaneously distribute the quantum secret key. We are already using the QKD protocol with simulated results matched completely with the theoretical concepts.

DOI
10.1088/1742-6596/2056/1/012011

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Abstract A new eavesdropping strategy is proposed for the Quantum Key Distribution (QKD) protocol. This scheme represents a new kind of intercept/resend strategy based on Bell’s theorem. Quantum key distribution (QKD) provides the foremost reliable form of secure key exchange, using only the input-output statistics of the devices to realize information-theoretic security. In this paper, we present an improved QKD protocol that can simultaneously distribute the quantum secret key. We are already using the QKD protocol with simulated results matched completely with the theoretical concepts.
Quantum Key Distribution (QKD) allows two legitimate parties to establish a secret key with informationtheoretic security. However, existing protocols have a very low noise tolerance, limiting their deployment in practical quantum channels with finite resources. We propose a novel QKD protocol based on entanglement swapping that achieves higher noise tolerance and improved key rates. In the proposed protocol, a six-bit symbol is encoded in a six-qubit state formed by randomly grouping the state into three pairs to form three Bell states. The proposed protocol maintains a positive secrecy rate for eavesdropper interception probabilities approaching 100 % under the intercept-and-resend attack model, significantly outperforming existing protocols in the literature.
The traditional security system, which depends on asymmetric and symmetric key exchange protocol, is now under threat due to recent developments in quantum computing. In order to generate the safe key without storing the qubit by the sender or recipient trustworthy parties, a unique Quantum Key Distribution (QKD) protocol was presented. Four random classical bits coupled to generate a pair of bell states in any of the places {(1,2,3,4), (1,3,2,4) and (1,4,2,3)}. "n/2" groups were used to generate the raw key while the remaining groups were used to check for Eve. The flying bell states scatter into four separate bell states as a result of Eve's involvement in choosing the incorrect measurement basis, which causes entanglement swapping and its identification during communication. The sender will alter the key in accordance with the receiver's position preference because, in traditional communication, key receiving parties must announce the position information. Under the intercept-measure-resend attack, the trade-off between the key generating rate and disturbance is computed and security is examined. Circuit simulation is demonstrated graphically in IBM Quantum Lab and the proposed protocol is implemented.
Recently, Zhang, Li and Guo (ZLG) suggested a new approach to quantum key distribution by using a shared Bell state which acts as quantum key in order to encode and decode classical information. Subsequently, others extended ZLG protocol to d-dimensional systems and to quantum secret sharing based on reusable GHZ states. However, Gao et al. have shown that if Eve employs a special strategy to attack, these protocols become insecure. Afterwards, they repair ZLG protocol so that their eavesdropping strategy becomes inefficient. In this paper, we investigate the security of ZLG quantum key distribution protocol and show that it is not secure against Eve's attacks and with probability of one half she gets all of the keys without being detected by the two parties. In this eavesdropping strategy, Eve transforms the previously shared Bell state between Alice and Bob to two Bell states among herself and the parties. Moreover, we briefly show that ZLG's repairing by Gao et al's is not efficient against of our attack and Eve can choose an appropriate rotation angle and measurement bases which help her to do eavesdropping. Afterwards, we discuss generalization of ZLG protocol to d-dimensional systems and show that with probability 1/d, Eve gets all of keys. We show that quantum secret sharing based on reusable GHZ states is also not secure and with probability one half, Eve gets all of keys. We repair them by going to higher dimensional shared EPR or GHZ states. Finally, we compare ZLG protocol with ours and show that the ZLG protocol and its extensions are less robust against the channel noise with respect to ours.
This paper presents a novel approach to enhancing the security of Quantum Key Distribution (QKD) protocols by leveraging multi-partite entangled states and dynamic entanglement control. Current QKD protocols, while providing theoretical security guarantees, remain vulnerable to sophisticated attacks that exploit imperfections in quantum hardware and potential eavesdropping strategies. Our work addresses this limitation by introducing a framework where multiple entangled states are employed simultaneously, and their entanglement is dynamically adjusted during the key distribution process. This dynamic control mitigates the impact of noise and reduces the effectiveness of various attack vectors, including those targeting Bell inequality violations and time-dependent attacks. We formally analyze the security of this enhanced protocol, demonstrating its resilience against a broader range of attacks. The key contributions lie in the development of a robust protocol architecture and the implementation of a sophisticated control mechanism that maintains entanglement fidelity and security even under adverse conditions. The proposed method significantly improves the practical security of QKD systems, paving the way for more reliable and secure quantum communication networks.
Quantum key distribution (QKD) enables secure key sharing between distant parties, with several protocols proven resilient against conventional eavesdropping strategies. Here, we introduce a new attack scenario where an eavesdropper, Eve, exploits a quantum switch using the indefinite causal order to intercept and manipulate quantum communication channel. Using multiple metrics such as the information gain, mutual information, and Bell violation, we demonstrate that the presence of a quantum switch significantly compromises QKD security. Our results highlight a previously overlooked vulnerability, emphasizing the need for countermeasures against quantum-controlled adversarial strategies.