Forcible-Measurement Attack on Quantum Secure Direct Communication Protocol with Cluster State

量的安全有簇状态的安全直接通讯(QSDC ) 协议被分析。一个偷听者什么时候在播送粒子上执行强迫的大小，被显示出秘密将部分外面被漏。在在最小的错误辨别的结果的帮助下，上面的界限(即 40%) 这，漏被获得。而且，使漏活动范围成为这界限的特别大小被给。

LINEAR PROVABLE SECURITY FOR A CLASS OF UNBALANCED FEISTEL NETWORK

A structure iterated by the unbalanced Feistel networks is introduced. It is showed that this structure is provable resistant against linear attack. The main result of this paper is that the upper bound of r-round （r≥2m） linear hull probabilities are bounded by q^2 when around function F is bijective and the maximal linear hull probabilities of round function F is q. Application of this structure to block cipher designs brings out the provable security against linear attack with the upper bounds of probabilities.

Robust Multiparty Quantum Secret Sharing against Participant Forcible Manipulation

The security of the multiparty quantum secret sharing protocol proposed by Gao [G.Gao,Commun.Theor.Phys.52 (2009) 421] is analyzed.It is shown that this protocol is vulnerable since the agents' imperfectencryption scheme can be attacked by a powerful participant.We introduce a attack strategy called participant forciblemanipulation and analyze the information leakage in this protocol under this attack.At last,we give an improved versionof the original protocol.The improved protocol is robust and has the same efficiency as the original one.

Precise Transformation of Feistel to SP Fuse into LFSR

For the published block cipher algorithm, two kinds of round functions have been researched.Block ciphers in network environments are taking more risks than ever before because of their initialization key's distribution in the internet.The security of block cipher algorithm is affected by linear bias and nonlinear bias which are restricted by confusion layer and diffusion layer.This article takes an approach on how block cipher's two round structures are initially transformed when they fuse into LFSR.The SP structure can be considered two F functions in one Feistel round function which combines both right and left of origin data transformation.Furthermore, the round number linear function and nonlinear function of Feistel and SP structure are compared.The merit of SP structure is that it can fuse in LFSR as a nonlinear filter without memory.

Formalization of Fault Analysis and a New Approach of Fault Detection

Substitution permutation network (SPN) is one important structure of block cipher cryptosystems. Prior work has shown different fault analyses on SPN. The formalization of fault analysis of both attack and protect on SPN have been given. The overhead and time tolerance of fault detection have been discussed. The pseudo-blinding method to detect fault attack is introduced, and the balance of the security, overhead and time tolerance based on the evaluation could be made.

Teleportation attack on the QSDC protocol with a random basis and order

The quantum secure direct communication （QSDC） protocol with a random basis and order is analysed and an effective attack, i.e. teleportation attack, is presented. An eavesdropper can obtain half of the transmitted secret bits with the help of this special attack. It is shown that quantum teleportation can be employed to weaken the role of the order-rearrangement encryption at least in a certain circumstance. Meanwhile, a possible improvement on this protocol is proposed, which makes it secure against this kind of attack.

Probabilistic teleportation of multi-particle partially entangled state

Utilizing the generalized measurement described by positive operator-wlued measure, this paper comes up with a protocol for teleportation of an unknown multi-particle entangled （GHZ） state with a certain probability. The feature of the present protocol is to weaken requirement for the quantum channel initially shared by sender and receiver. All unitary transformations performed by receiver are summarized into a formula. On the other hand, this paper explicitly constructs the efficient quantum circuits for implementing the proposed teleportation by means of universal quantum logic operations in quantum computation.

A Special Eavesdropping on One-Sender Versus N-Receiver QSDC Protocol

我们分析量的安全安全直接通讯(QSDC ) 协议并且发现一个偷听者能利用 GHZ 状态的一个特殊性质没有被检测，得到所有播送秘密或部分。特别攻击策略详细被介绍。我们给这个协议的一个改进版本以便它能抵抗这攻击。

Participant attack on quantum secret sharing based on entanglement swapping

The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.

An efficient quantum secure direct communication scheme with authentication

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.

Cryptanalysis of Multiparty Quantum Secret Sharing of Quantum State Using Entangled States

量状态协议分享的一个量秘密的安全由郭等求婚了。[下巴。Phys。Lett。25 (2008 ) 16 ] 被再考。一个偷听者能由由拦截量状态监视古典隧道或全部秘密获得一些播送秘密信息，这被显示出，并且而且，没有被检测，偷听者能甚至有敌意地用一条任意的消息代替秘密消息。最后，一个偷听者能攻击这个协议的深原因被讨论，修改协议被介绍修改安全枪眼。[从作者抽象]

High Efficiency of Two Efficient QSDC with Authentication Is at the Cost of Their Security

Two efficient protocols of quantum secure direct communication with authentication [Chin. Phys. Lett. 25 （2008） 2354] were recently proposed by Liu et al. to improve the efficiency of two protocols presented in [Phys. Rev. A 75 （2007） 026301] by four Pauli operations. We show that the high efficiency of the two protocols is at the expense of their security. The authenticator Trent can reach half the secret by a particular attack strategy in the first protocol. In the second protocol, not only Trent but also an eavesdropper outside can elicit half-information about the secret from the public declaration.

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

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]

Probabilistic teleportation of a non-symmetric three-particle state

This paper proposes a scheme for teleporting a kind of essential three-particle non-symmetric entangled state, which is much more valuable than a GHZ and W state for some applications in quantum information processing. In comparison with previous proposal of teleportation, the resources of entangled states as quantum channel and the number of classical messages required by our scheme can be cut down. Moreover, it is shown that there exists a class of transformations which ensure the success of this scheme, because the two-particle transformation performed by the receiver in the course of teleportation may be a generic two-particle operation instead of a control-NOT （CNOT） operation. In addition, all kinds of transformations performed by sender and receiver are given in detail.

Robust Quantum Secure Direct Communication over Collective Rotating Channel

量在一条集体旋转隧道上的安全直接通讯协议被建议。协议把逻辑位编码为无声 subspaces，并且它能因此在受到集体旋转噪音的任意的度的一条量隧道上工作。尽管纠缠的状态被使用，发送者和接收装置仅仅被要求动单个粒子的产品测量或泡利不相容原理手术。协议与今日的技术是可行的。

A New Solution to Detectable Byzantine Agreement Problem

We present a new quantum protocol for solving detectable Byzantine agreement problem between threeparties by employing one quantum key distribution protocol.The protocol is suggested by a special four-qubit entangledstate instead of singlet states,which shows that singlet states are not necessary to achieve detectable Byzantine agreement.

Multiparty Quantum Chatting Scheme

我们建议直接通讯计划基于格林 Horne-Zeilinger (GHZ ) 说的新多党的同时的量并且稠密的编码。为没有漏任何信息，完成高效率，四个编码计划预先被准备。现在的计划有播送的能力(M + 1 ) 当时，每一些 M 粒子， GHZ 说的 M 古典位在那里存在 M 聚会。重排的技术粒子平等地做合法用户在一样的长度交换他们的消息。对普通攻击的高效率和优秀安全是这个新计划的优点。

A quantum encryption scheme using d-level systems

Using the generalized Bell states and quantum gates, we introduce a quantum encryption scheme of d-level states （qudits）. The scheme can detect and correct arbitrary transmission errors using only local operations and classical communications between the communicators. In addition, the entanglement key used to encrypt can be recycled. The protocol is informationally secure, because the output state is a totally mixed one for every input state p.

对RSA密码系统旁路攻击的防御(英文)

基于方面隧道攻击(SCA ) 的结构到秘密成员系统能抵抗的 RSA 差错攻击并且为消息和秘密代表与随机化方法结合，一个新实现计划基于 CRT (中国仍然是的定理) RSA 被建议。建议计划能阻止分析(矿泉) ，微分力量分析(DPA ) 和时间攻击的简单力量，并且也与存在 RSA-CRT 秘密成员系统兼容。另外，为抵抗差错攻击的改进被建议，它能减少额外的计算时间。