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Analysis of a kind of quantum cryptographic schemes based on secret sharing

science china(Physics,Mechanics & Astronomy) 2009年第9期52卷 1313-1316页

作者： zhang xinglan1 & JI {2. college of computer science and technology, beijing university of technology, beijing 10012., china 2.State Key Laboratory of Information Security, Graduate university of Chinese Academy of sciences, {12. 100049, china college of computer {2. and technology Beijing University of Technology Beijing 100124 China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences Beijing 100049 China

Recently, Yang et al. proposed a kind of quantum cryptographic schemes based on secret sharing. The main idea is drawn from the case, where any n participants who share a secret K can co-operate as K does. This process can be applied to encryption, authentication, signature and so on. Unfortunately, since there is no identity authentication of the share's holder, these schemes inherit the limitation of secret sharing in practice. If some participants do not follow the protocol, the protocol would be a failure at last. Moreover, these schemes encounter another serious attack. Any two participants can co-operate to defeat the schemes by sending different shares to the parties unknown to the distributor of the secret K, such that these parties can execute the protocol as well. The attack proves that it is not enough for quantum cryptographic schemes that only the secret key is secure.

关键词： quantum identity authentication quantum secure direct communication quantum signature secret sharing

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EMAT Detection Method of Spray Cooling Characteristics for Industrial Nozzle

EMAT Detection Method of Spray Cooling Characteristics for I...

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第2.届中国控制与决策会议

作者： Qi OUYANG Yue Bing ZENG xinglan zhang Xi Meng CHEN Institute of Smart System and Renewable Energy College of AutomationChongqing University college of computer {2. and Engineering Chongqing University of Technology

ISBN: (纸本)9781479937097

The paper describes a new ultrasonic measurement technology that evaluates a spray nozzle cooling characteristics based on measured time-of-flight data using an electromagnetic ultrasonic transducer（EMAT）. A spiral electromagnetism ultrasonic transducer was used to measure the ultrasonic velocity dependence of temperature in a certain thickness metal plate. The instantaneous time-of-flight time data were used to determine the velocity and deduce the interior and surface temperature. To verify the validity of the ultrasonic measurement result, one-dimensional unsteady heat transmission equation is established to compute the heat transfer coefficients（HTC） theoretically compared with ultrasonic measurement results. Through some one-dimensional analysis, this work will show that the HTC is a natural and stable quantity to estimate ultrasonic time of flight measurements.

关键词： Heat Transfer Ultrasonic Spray cooling Pulse-echo

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