共查询到20条相似文献,搜索用时 63 毫秒
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最近,一种基于Bell态粒子和单光子混合的量子安全直接通信方案[物理学报65 230301(2016)]被提出.文章宣称一个量子态可以编码3比特经典信息,从而使得协议具有很高的信息传输效率.不幸的是,该协议存在信息泄露问题:编码在单光子上的3比特经典信息有2比特被泄露,而编码在Bell态上的3比特经典信息有1比特被泄露,所以它不是一个安全的直接量子通信方案.在保留原协议思想且尽可能少地更改原协议的基础上,我们提出一种改进的消息编码规则,从而解决信息泄露问题,使之成为一个高效、安全的量子通信协议.衷心希望研究者能对量子安全通信协议中信息泄露问题引起足够重视,设计真正安全的量子通信协议. 相似文献
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HAN Lian-Fang CHEN Yue-Ming YUAN Hao 《理论物理通讯》2009,51(4):648-652
We propose a deterministic quantum secure direct two check photon sequences are used to check the securities of the communication protocol by using dense coding. The channels between the message sender and the receiver. The continuous variable operations instead of the usual discrete unitary operations are performed on the travel photons so that the security of the present protocol can be enhanced. Therefore some specific attacks such as denial-of-service attack, intercept-measure-resend attack and invisible photon attack can be prevented in ideal quantum channel. In addition, the scheme is still secure in noise channel. Furthurmore, this protocol has the advantage of high capacity and can be realized in the experiment. 相似文献
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In this paper an efficient quantum secure direct communication (QSDC) scheme with
authentication is presented, which is based on quantum entanglement and
polarized single photons. The present protocol uses Einstein--Podolsky--Rosen
(EPR) pairs and polarized
single photons in batches. A particle of the EPR pairs is retained
in the sender's station, and the other is transmitted forth and back
between the sender and the receiver, similar to the `ping--pong'
QSDC protocol. According to the shared information beforehand, these
two kinds of quantum states are mixed and then transmitted via a
quantum channel. The EPR pairs are used to transmit secret messages
and the polarized single photons used for authentication and
eavesdropping check. Consequently, because of the dual contributions
of the polarized single photons, no classical information is needed.
The intrinsic efficiency and total efficiency are both 1 in this
scheme as almost all of the instances are useful and each EPR pair
can be used to carry two bits of information. 相似文献
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A quasi-secure quantum dialogue protocol using single photons was proposed. Different from the previous entanglement-based protocols, the present protocol uses batches of single photons which run back and forth between the two parties. A round run for each photon makes the two parties each obtain a classical bit of information. So the efficiency of information transmission can be increased. The present scheme is practical and well within the present-day technology. 相似文献
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This paper is based on previous quantum encryption proposed by researchers developing a scheme for cryptography using symmetric keys.This study has pointed out that the scheme consists of a pitfall that could lead to a controlled-NOT(CNOT)extraction attack.A malicious user can obtain the secret message of a sender without being detected by using a sequence of single photons and a controlled-NOT gate. 相似文献
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In 2011, Kang and Fang (Commun. Theor. Phys. 55:239–243, 2011) presented a quantum direct communication protocol using single photons. This study points out a pitfall in Kang and Fang’s scheme, in which an eavesdropper can launch a measure-and-resend attack on this scheme to reveal the secret message. Furthermore, an improved scheme is proposed to avoid the attack. 相似文献
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YI Xiao-Jie NIE Yi-You ZHOU Nan-Run HUANG Yi-Bing HONG Zhi-Hui LI Song-Song 《理论物理通讯》2008,50(1):81-84
We present a scheme for quantum secure direct communication, in which the message is encoded by local unitary operations, transmitted through entangled photons, and deduced from both the sender and receiver's local measurement results. In such a scheme, only one pair of entangled photons is consumed, and there is no need to transmit the sender's qubit carrying the secret message in a public channel, in order to transmit two-bit classical information. 相似文献
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A novel deterministic secure quantum communication (DSQC) scheme is presented based on Einstein-Podolsky-Rosen (EPR) pairs and single photons in this study. In this scheme, the secret message can be encoded directly on the first particles of the prepared Bell states by simple unitary operations and decoded by performing the Bell-basis measurement after the additional classic information is exchanged. In addition, the strategy with two-step transmission of quantum data blocks and the technique of decoy-particle checking both are exploited to guarantee the security of the communication. Compared with some previous DSQC schemes, this scheme not only has a higher resource capacity, intrinsic efficiency and total efficiency, but also is more realizable in practical applications. Security analysis shows that the proposed scheme is unconditionally secure against various attacks over an ideal quantum channel and still conditionally robust over a noisy and lossy quantum channel. 相似文献
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A novel deterministic secure quantum communication(DSQC)scheme is presented based on EinsteinPodolsky-Rosen(EPR)pairs and single photons in this study.In this scheme,the secret message can be encoded directly on the first particles of the prepared Bell states by simple unitary operations and decoded by performing the Bell-basis measurement after the additional classic information is exchanged.In addition,the strategy with two-step transmission of quantum data blocks and the technique of decoy-particle checking both are exploited to guarantee the security of the communication.Compared with some previous DSQC schemes,this scheme not only has a higher resource capacity,intrinsic efciency and total efciency,but also is more realizable in practical applications.Security analysis shows that the proposed scheme is unconditionally secure against various attacks over an ideal quantum channel and still conditionally robust over a noisy and lossy quantum channel. 相似文献
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A multi-sender-controlled quantum teleportation scheme is proposed
to teleport several secret quantum states from different senders to
a distance receiver based on only one Einstein-Podolsky-Rosen (EPR)
pair with controlled-NOT (CNOT) gates. In the present scheme, several secret single-qubit quantum states are encoded into a multi-qubit entangled quantum state. Two communication modes, i.e.,
the detecting mode and the message mode, are employed so that the
eavesdropping can be detected easily and the teleported message may
be recovered efficiently. It has an advantage over teleporting
several different quantum states for one scheme run with more
efficiency than the previous quantum teleportation schemes. 相似文献
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We introduce an attack scheme for eavesdropping freely the ping-pong
quantum communication protocol proposed by Bostr\"{o} m and Felbinger
[Phys. Rev. Lett. 89, 187902 (2002)] in a noise channel.
The vicious eavesdropper, Eve, intercepts and measures the travel
photon transmitted between the sender and the receiver. Then she
replaces the quantum signal with a multi-photon signal in the same
state, and measures the returned photons with the measuring basis,
with which Eve prepares the fake signal except for one photon. This
attack increases neither the quantum channel losses nor the error
rate in the sampling instances for eavesdropping check. It works for
eavesdropping the secret message transmitted with the ping-pong
protocol. Finally, we propose a way for improving the security of
the ping-pong protocol. 相似文献
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Zhigang Chen Xiaoping Lou Ying Guo 《International Journal of Theoretical Physics》2013,52(9):3141-3149
Motivated by hybrid entanglement swapping, a cooperative protocol for quantum anonymous transmission is proposed. In the protocol, three pairs of hybrid-entangled photons are deployed in the small-scale quantum network, where a photon is traveling from one random participant to another. After performing by entanglement swapping among all participants, the anonymous transmission system is established in a cooperative way. Analysis shows that the proposed scheme achieves the secure anonymity for both sender and receiver. In addition, it can transmit quantum message with high efficiency. 相似文献
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In this paper, two new efficient multiparty quantum direct secret sharing schemes are proposed via a six-particle GHZ state and Bell measurements. In the first scheme, based on the theory of security cryptanalysis, the secret message of the sender is directly encoded into the transmitted particles, and all the agents can obtain their information by performing bell measurement on the received particles, and then cooperate to recover the information of the sender. In the second scheme, we define a new secret shared coding method by performing local unitary operations on the transmitted particles, then agents perform Bell measurements on their own particles respectively, and feedback the measurement to the dealer. If the agent's results are matched with the previous coding method, the protocol will work out.In addition, the proposed two schemes have the following common advantages: the sender can send all prepared particles to the receiver, and can send an arbitrary key to the receiver, rather than a random secret key; the proposed schemes do not need to insert any detection sets to detect eavesdropping and can resist both existing attacks and spoofing attacks by dishonest agents. The sender need not to retain any photons, so the sender's quantum memory could be omitted here. 相似文献
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Dawei Tang Tie-jun Wang Sichen Mi Xiao-Meng Geng Chuan Wang 《International Journal of Theoretical Physics》2016,55(11):4963-4971
Quantum secret sharing is to distribute secret message securely between multi-parties. Here exploiting orbital angular momentum (OAM) state of single photons as the information carrier, we propose a high-dimensional circular quantum secret sharing protocol which increases the channel capacity largely. In the proposed protocol, the secret message is split into two parts, and each encoded on the OAM state of single photons. The security of the protocol is guaranteed by the laws of non-cloning theorem. And the secret messages could not be recovered except that the two receivers collaborated with each other. Moreover, the proposed protocol could be extended into high-level quantum systems, and the enhanced security could be achieved. 相似文献
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We propose two schemes for realizing quantum secure direct communication (QSDC) by using a set of ordered two-photon three-dimensional hyperentangled states entangled in two degrees of freedom (DOFs) as quantum information channels. In the first scheme, the photons from Bob to Alice are transmitted only once. After insuring the security of the quantum channels, Bob encodes the secret message on his photons. Then Alice performs single-photon two-DOF Bell bases measurements on her photons. This scheme has better security than former QSDC protocols. In the second scheme, Bob transmits photons to Alice twice. After insuring the security of the quantum channels, Bob encodes the secret message on his photons. Then Alice performs two-photon Bell bases measurements on each DOF. The scheme has more information capacity than former QSDC protocols. 相似文献
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A scheme of multiparty quantum secret sharing of classical messages (QSSCM) is proposed based on single photons and local unitary operations. In this scheme, eavesdropping checks are performed only twice, and one photon can generate one bit of classical secret message except those chosen for eavesdropping check; in addition, only the sender and one of the agents are required to store photons. Thus, this scheme is more practical and efficient. 相似文献