2003年Akavia基于列表译码提出研究硬核谓词的一般框架,并将该方法成功地应用于许多硬核谓词的研究.但是,对于ax+b mod p的任意比特是任意单向函数的硬核谓词,这个关于单向函数的一般性结论能否适用,仍是一个公开问题.文章利用这种新方...2003年Akavia基于列表译码提出研究硬核谓词的一般框架,并将该方法成功地应用于许多硬核谓词的研究.但是,对于ax+b mod p的任意比特是任意单向函数的硬核谓词,这个关于单向函数的一般性结论能否适用,仍是一个公开问题.文章利用这种新方法研究积性码可接近的单向陷门函数的比特安全性,并且证明ax+b mod p的任意比特是p阶循环群上该类单向函数的硬核谓词.展开更多
We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary large.The state which we used,has special properties that make our ...We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary large.The state which we used,has special properties that make our scheme simple and safe.The operations which are needed to recover secret message,are only exclusive-or addition and complement operation.Moreover it is shown that this scheme is secure against eavesdropping.Also this scheme provides the best quantum bit efficiency compared with some famous quantum secret sharing schemes.展开更多
A two-step quantum secure direct dialogue protocol using Einstein-Podolsky-Rosen(EPR)pair block is proposed.In the protocol,the dialogue messages are encoded on series of qubits and sent through a quantum channel dire...A two-step quantum secure direct dialogue protocol using Einstein-Podolsky-Rosen(EPR)pair block is proposed.In the protocol,the dialogue messages are encoded on series of qubits and sent through a quantum channel directly.The security of the protocol is assured by its connection to the two-step quantum secure direct communication protocol,which has been proved secure.This protocol has several advantages.It is a direct communication protocol that does not require a separate classical communication for the ciphertext.It has high capacity as two bits of secret messages can be transmitted by an EPR pair.As a dialogue protocol,the two parties can speak to each other either simultaneously or sequentially.展开更多
Considering the air-water interface and ocean water’s optical attenuation,the performance of quantum key distribution(QKD)based on air-water channel is studied.The effects of photons’various incident angles to air-w...Considering the air-water interface and ocean water’s optical attenuation,the performance of quantum key distribution(QKD)based on air-water channel is studied.The effects of photons’various incident angles to air-water interface on quantum bit error rate(QBER)and the maximum secure transmission distance are analyzed.Taking the optical attenuation of ocean water into account,the performance bounds of QKD in different types of ocean water are discussed.The simulation results show that the maximum secure transmission distance of QKD gradually reduces as the incident angle from air to ocean water increases.In the clearest ocean water with the lowest attenuation,the maximum secure transmission distance of photons far exceeds the the working depth of underwater vehicles.In intermediate and murky ocean waters with higher attenuation,the secure transmission distance shortens,but the underwater vehicle can deploy other accessorial methods for QKD with perfect security.So the implementation of OKD between the satellite and the underwater vehicle is feasible.展开更多
文摘2003年Akavia基于列表译码提出研究硬核谓词的一般框架,并将该方法成功地应用于许多硬核谓词的研究.但是,对于ax+b mod p的任意比特是任意单向函数的硬核谓词,这个关于单向函数的一般性结论能否适用,仍是一个公开问题.文章利用这种新方法研究积性码可接近的单向陷门函数的比特安全性,并且证明ax+b mod p的任意比特是p阶循环群上该类单向函数的硬核谓词.
文摘We proposed a novel and efficient multiparty quantum secret sharing scheme using entangled state which in that the number of parties can be arbitrary large.The state which we used,has special properties that make our scheme simple and safe.The operations which are needed to recover secret message,are only exclusive-or addition and complement operation.Moreover it is shown that this scheme is secure against eavesdropping.Also this scheme provides the best quantum bit efficiency compared with some famous quantum secret sharing schemes.
基金supported by the National Natural Science Foundation of China(Grant Nos.10874098 and 11175094)the National Basic Research Program of China(Grant Nos.2009CB929402 and 2011CB9216-002)
文摘A two-step quantum secure direct dialogue protocol using Einstein-Podolsky-Rosen(EPR)pair block is proposed.In the protocol,the dialogue messages are encoded on series of qubits and sent through a quantum channel directly.The security of the protocol is assured by its connection to the two-step quantum secure direct communication protocol,which has been proved secure.This protocol has several advantages.It is a direct communication protocol that does not require a separate classical communication for the ciphertext.It has high capacity as two bits of secret messages can be transmitted by an EPR pair.As a dialogue protocol,the two parties can speak to each other either simultaneously or sequentially.
基金supported by the National High Technology Research and Development Program of China(No.2011AA7014061)
文摘Considering the air-water interface and ocean water’s optical attenuation,the performance of quantum key distribution(QKD)based on air-water channel is studied.The effects of photons’various incident angles to air-water interface on quantum bit error rate(QBER)and the maximum secure transmission distance are analyzed.Taking the optical attenuation of ocean water into account,the performance bounds of QKD in different types of ocean water are discussed.The simulation results show that the maximum secure transmission distance of QKD gradually reduces as the incident angle from air to ocean water increases.In the clearest ocean water with the lowest attenuation,the maximum secure transmission distance of photons far exceeds the the working depth of underwater vehicles.In intermediate and murky ocean waters with higher attenuation,the secure transmission distance shortens,but the underwater vehicle can deploy other accessorial methods for QKD with perfect security.So the implementation of OKD between the satellite and the underwater vehicle is feasible.
