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Quantum threshold group signature

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science china(Physics,Mechanics & Astronomy) 2008年第10期51卷 1505-1514页

作者： yang yuguang1,2.3 & wen qiaoyan4 1 college of computer science and technology, {2. University of technology, beijing 10012., china 2.State Key Laboratory of Integrated Services Network, Xidian University, Xi’an 710071, china 3 State Key Laboratory of Information Security (Graduate University of Chinese Academy of sciences), {2. 100049, china 4 State Key Laboratory of Networking and Switching technology, {2. University of Posts and Tele-communications, {2. 100876, china college of computer {2. and technology Beijing University of Technology Beijing 100124 China State Key Laboratory of Integrated Services Network Xidian University Xi’an 710071 China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

In most situations, the signer is generally a single person. However, when the message is written on behalf of an organization, a valid message may require the approval or consent of several persons. Threshold signature is a solution to this problem. Generally speaking, as an authority which can be trusted by all members does not exist, a threshold signature scheme without a trusted party appears more attractive. Following some ideas of the classical Shamir’s threshold signature scheme, a quantum threshold group signature one is proposed. In the proposed scheme, only t or more of n persons in the group can generate the group signature and any t-1 or fewer ones cannot do that. In the verification phase, any t or more of n signature receivers can verify the message and any t-1 or fewer receivers cannot verify the validity of the signature.

关键词： threshold quantum signature trusted party quantum cryptography

Threshold quantum secret sharing between multi-party and multi-party

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science china(Physics,Mechanics & Astronomy) 2008年第9期51卷 1308-1315页

作者： yang yuguang1,2.3 & wen qiaoyan4 1 college of computer science and technology,{2. University of technology,beijing 10012.,china 2.State Key Laboratory of Integrated Services Network,Xidian University,Xi’an 710071,china 3 State Key Laboratory of Information Security (Graduate University of Chinese Academy of sciences),{2. 100049,china 4 State Key Laboratory of Networking and Switching technology,{2. University of Posts and Tele-communications,{2. 100876,china college of computer {2. and technology Beijing University of Technology Beijing 100124 China State Key Laboratory of Integrated Services Network Xidian University Xi’an 710071 China State Key Laboratory of Information Security (Graduate University of Chinese Academy of sciences) Beijing 100049 China State Key Laboratory of Networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold quantum secret sharing (TQSS) scheme between multi-party and multi-party was proposed using a sequence of single photons,which is useful and efficient when the parties of communication are not all present. We described the process of this TQSS scheme and discussed its security. It was shown that entan-glement is not necessary for quantum secret sharing. Moreover,the theoretic effi-ciency was improved to approach 100% as almost all the instances can be used for generating the private key,and each photon can carry one bit of information. This protocol is feasible with the present-day technique.

关键词： threshold quantum secret sharing quantum cryptography single photon multi-party and multi-party

Quasi-secure quantum dialogue using single photons

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science china(Physics,Mechanics & Astronomy) 2007年第5期50卷 558-562页

作者： yang yuguang1,2.& wen {2.31 {2. of computer science and technology, beijing University of technology, beijing 10002., china 2.State Key Laboratory of Information Security, Graduate University of the Chinese Academy of sciences, beijing 100049, china 3 School of science, beijing University of Posts and Telecommunications, beijing 100876, china college of computer {2. technology Beijing University of Technology Beijing 100022 China State Key Laboratory of Information Security Graduate University of the Chinese Academy of Sciences Beijing 100049 China School of science Beijing University of Posts Telecommunications Beijing 100876 China

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.

关键词： quantum dialogue, single photon, quantum secure direct communication

Threshold proxy quantum signature scheme with threshold shared verification

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science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 1079-1088页

作者： yang yuguang1,3,4 & wen {2.2.1 {2. of computer science and technology,beijing University of technology,beijing 10012.,china 2.State Key Laboratory of Networking and Switching technology,beijing University of Posts and Tele-communications,beijing 100876,china 3 State Key Laboratory of Integrated Services Network,Xidian University,Xi’an 710071,china 4 State Key Laboratory of Information Security(Graduate University of Chinese Academy of sciences) ,beijing 100049,china 1. college of computer {2. and technology Beijing University of Technology Beijing 100124 China 3. State Key Laboratory of Integrated Services Network Xidian University Xi’an 710071 China 4. State Key Laboratory of Information Security (Graduate University of Chinese Academy of sciences) Beijing 100049 China 2. State Key Laboratory of Networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

A threshold proxy quantum signature scheme with threshold shared verification is proposed. An original signer could authorize a group as its proxy signers. Then only t or more of n persons in the proxy group can generate the proxy signature on behalf of the original signer and any t-1 or fewer ones cannot do that. When the proxy signature needs to be verified,any t or more of n persons belonging to the verification group can verify the message and any t-1 or fewer ones cannot verify the validity of the proxy signature.

关键词： quantum signature threshold proxy quantum group signature threshold shared verification

Multiparty simultaneous quantum identity authentication with secret sharing

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science china(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： yang yuguang1,2.wen {2.3 & ZHANG Xing4,5 1 {2. of computer science and technology,beijing University of technology,beijing 10002.,china 2.State Key Laboratory of Information Security (Graduate University of the Chinese Academy of sciences),beijing 100049,china 3 School of science,beijing University of Posts and Telecommunications,beijing 100876,china 4 Institute of Electronic technology,Information Engineering University,Zhengzhou 450004,china 5 Trusted Computing Laboratory,beijing University of technology,beijing 10002.,china college of computer {2. technology Beijing University of Technology Beijing 100022 China State Key Laboratory of Information Security [Graduate University of the Chinese Academy of sciences] Beijing 100049 China School of science Beijing University of Posts Telecommunications Beijing 100876 China Institute of Electronic technology Information Engineering University Zhengzhou 450004 China Trusted Computing Laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

An efficient quantum secret sharing protocol with orthogonal product states

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science china(Physics,Mechanics & Astronomy) 2007年第3期50卷 331-338页

作者： yang yuguang1,2. wen {2.3 & ZHU FuChen4 1 School of {2., beijing University of technology, beijing 10002., china 2.State Key Laboratory of Information Security, Graduate University of Chinese Academy of sciences, beijing 10002., china 3 School of science, beijing University of Posts and Telecommunications, beijing 100876, china 4 National Key Laboratory for Modern Communications, Chengdu 610041, china 1. School of computer Beijing University of Technology Beijing 100022 China 2. State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100022 China 3. School of science Beijing University of Posts and Telecommunications Beijing 100876 China 4. National Key Laboratory for Modern Communications Chengdu 610041 China

An efficient quantum secret sharing protocol with orthogonal product states in the 33 Hilbert space is presented. The particles in the orthogonal product states form two particle sequences. One sequence is sent to Bob and the other is sent to Charlie after rearranging the particle orders. With the help of Alice, Bob and Charlie make the corresponding local measurement to obtain the information of the or- thogonal product states prepared. This protocol has many distinct features such as great capacity and high efficiency.

关键词： quantum secret sharing orthogonal product state orthogonal measurement

Quantum secure direct communication with cluster states

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science china(Physics,Mechanics & Astronomy) 2010年第7期53卷 1271-1275页

作者： CAO WeiFeng yang yuguang {2. {2. college of Electric and Information Engineering Zhengzhou University of Light IndustryZhengzhou 450002China State Key Laboratory of Networking and Switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China college of computer {2. and technology Beijing University of TechnologyBeijing 100124China State Key Laboratory of Integrated Services Network Xidian UniversityXi’an 710071China State key Laboratory of Information Security Gradute University of Chinese Academy of sciences Beijing 100049China

A quantum secure direct communication protocol with cluster states is *** with the deterministic secure quantum communication protocol with the cluster state proposed by Yuan and Song(***.,2.09,7:689),this protocol ca... 详细信息

关键词： quantum secure direct communication deterministic secure quantum communication cluster state

Concrete Physics Method for Solving NP hard Problem

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Wuhan University Journal of Natural sciences 2001年第Z1期6卷 140-146页

作者： Huang wen\|qi college of {2. {2., Huazhong University of {2. and technology, Wuhan 430074,china Laboratory of {2. {2., Institute of Software, Chinese Academy of {2.s, beijing 100080, china college of computer {2. Huazhong University of Science and Technology Wuhan China Laboratory of computer science Institute of Software Chinese Academy of Sciences Beijing China

With a NP hard problem given, we may find a equivalent physical world. The rule of the changing of the physical states is simply the algorithm for solving the original NP hard problem .It is the most natural algorithm for solving NP hard problems. In this paper we deal with a famous example , the well known NP hard problem——Circles Packing. It shows that our algorithm is dramatically very efficient. We are inspired that, the concrete physics algorithm will always be very efficient for NP hard problem.

关键词： concrete physics algorithm NP hard problem circles packing the rule of the changing of the physical states

Fault tolerant quantum secret sharing against collective-amplitude-damping noise

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science china(Physics,Mechanics & Astronomy) 2011年第9期54卷 1619-1624页

作者： yang yuguang CHAI HaiPing WANG Yuan TENG YiWei {2. {2. college of computer {2. and technology Beijing University of Technology Beijing 100124 China State Key Laboratory of Integrated Services Network Xidian University Xi'an 710071 China State Key Laboratory of Networking and Switching technology Beijing University of Posts and Telecommunications Beijing 100876 China

We present a quantum secret sharing protocol against collective-amplitude-damping noise. Each logical qubit is encoded in two qubit noiseless states. So it can function over such a noisy channel. The two agents encode their messages on each logical qubit only by performing a permutation operation on two physical qubits. Although each logical qubit received by each agent only carries a bit of information, the boss Alice can read out her agents' information by discriminating two orthogonal states by performing single-qubit measurements assisted by local operation and classical communication (LOCC).

关键词： quantum secret sharing fault tolerant collective noise amplitude damping