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Chinese Physics Letters

Cryptanalysis and Improvement of Two GHZ-State-Based QSDC Protocols

郭奋卓, 秦素娟, Wen Qiao Yan, 朱甫臣

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

在一份最近的报纸[J。朝鲜语。Phys。Soc。49 (2006 ) 459 ] ，二 GHZ-state-based 量安全直接通讯协议被介绍。这里，我们指出一个偷听者能利用 GHZ 状态的一个特殊性质，即。“ correlation-elicitable ”到没有在两个协议被检测，获得播送秘密的半信息。特别攻击策略详细被表明。而且，可能的改进被建议，它对这种攻击使协议安全。[从作者抽象]

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在一份最近的报纸[J。朝鲜语。Phys。Soc。49 (2006 ) 459 ] ，二 GHZ-state-based 量安全直接通讯协议被介绍。这里，我们指出一个偷听者能利用 GHZ 状态的一个特殊性质，即。“ correlation-elicitable ”到没有在两个协议被检测，获得播送秘密的半信息。特别攻击策略详细被表明。而且，可能的改进被建议，它对这种攻击使协议安全。[从作者抽象]
In a recent paper[J. Korean. Phys. Soc. 49 (2006) 459], two GHZ-state-based quantum secure direct communication protocols were presented. Here we point out that an eavesdropper can utilize a special property of GHZ states, i.e. “correlation-elicitable" to obtain half information of the transmitted secrets without being detected in both protocols. The particular attack strategy is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocols secure against this kind of attack.
Extended three-particle GHZ state decoy is introduced in controlled quantum secure direct communication to improve eavesdropping detection probability and prevent correlation-elicitation (CE) attack.Each particle of extended three-particle GHZ state decoy is inserted into sending particles to detect eavesdroppers, which reaches 63% eavesdropping detection probability.And decoy particles prevent the receiver from obtaining the correct correlation between particle 1 and particle 2 before the sender coding on them, so that he can not get any secret information without the controller's permission.In the security analysis, the maximum amount of information that a qubit contains is obtained by introducing the entropy theory method, and two decoy strategies are compared quantitatively.If the eavesdroppers intend to eavesdrop on secret information, the per qubit detection rate of using only two particles of extended threeparticle GHZ state as decoy is 58%;while the presented protocol using three particles of extended three-particle GHZ state as decoy reaches per qubit 63%.