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Analysis and Improvement of Authenticatable Ring Signcryption Scheme

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Journal of Shanghai Jiaotong university(Science) 2008年第6期13卷 679-683页

作者：李发根 Shirase Masaaki takagi tsuyoshi School of Computer Science and Engineering University of Electronic Scienceand Technology of ChinaChengdu 610054China State Key Laboratory of Information Security Graduate School of Chinese Academyof SciencesBeijing 100049China School of Systems Information Science Future University-HakodateHakodate 041-8655Japan

We show that the Zhang-Yang-Zhu-Zhang identity-based authenticatable ring signcryption scheme is not secure against chosen plaintext ***, we propose an improved scheme that remedies the weakness of the Zhang-Yang-Zhu-Zhang *** improved scheme has shorter ciphertext size than the Zhang-Yang-Zhu-Zhang *** then prove that the improved scheme satisfies confidentiality, unforgeability, anonymity and authenticatability.

关键词： identity-based cryptography bilinear pairings ring signcryption ring signature

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抗主密钥泄露和连续泄露的双态仿射函数加密

计算机学报 2012年第9期35卷 1856-1867页

作者：张明武杨波 takagi tsuyoshi 华南农业大学信息学院广州510642 陕西师范大学计算机学院西安710072 九州大学工业数学研究所日本福冈819-0395

抗密钥泄露安全的加密系统保证在攻击者获得(主)密钥部分信息的情况下仍具有语义安全性.文中设计了一个抗密钥泄露的双态仿射函数加密方案,该方案中加密策略和解密角色定义为仿射空间,并且具有再次委托能力.在双系统加密模型下,实现了... 详细信息

抗密钥泄露安全的加密系统保证在攻击者获得(主)密钥部分信息的情况下仍具有语义安全性.文中设计了一个抗密钥泄露的双态仿射函数加密方案,该方案中加密策略和解密角色定义为仿射空间,并且具有再次委托能力.在双系统加密模型下,实现了自适应安全的抗有界的主密钥泄露和用户密钥连续泄露的加密方案,在标准模型下基于静态子群判定假设证明了该方案的安全性.同时,分析了方案中的主密钥和用户密钥的泄露界和泄露率,通过参数调整可以达到接近73%的泄露率,具有较好的抗泄露性质.

关键词：函数加密仿射空间抗泄露双系统加密可证安全

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隐私保护的推理机策略加密及应用

计算机学报 2015年第4期38卷 897-908页

作者：张明武杨波王春枝 takagi tsuyoshi 湖北工业大学计算机学院武汉430068 陕西师范大学计算机学院西安710072 九州大学工业数学研究所日本福冈819-0392 中国科学院信息工程研究所信息安全国家重点实验室北京100093

确定性有限自动状态机是能表示有限个状态以及在这些状态之间转移和动作等行为的数学模型.本文提出两种基于有限状态自动机策略的加密方案:第1种方案称为无消息负载方案,方案中密文关联到一有限自动机M而令牌关联到一个任意长的输入串w... 详细信息

确定性有限自动状态机是能表示有限个状态以及在这些状态之间转移和动作等行为的数学模型.本文提出两种基于有限状态自动机策略的加密方案:第1种方案称为无消息负载方案,方案中密文关联到一有限自动机M而令牌关联到一个任意长的输入串w,系统能在密文空间和密钥空间测试是否令牌关联的输入串可以被密文中的自动机接受.同时给出了转换到素数阶群构建的方法.第2种方案以前种方案为原语,扩展到支持消息负载保密的方案,当自动机接受输入串时,可以成功从密文中提取明文.采用双系统加密技术,在静态安全假设下证明了该方案达到标准模型下自适应语义安全性.同时给出了两种方案的性能评测.所提出的方案可应用于隐私保护的安全外包计算、网络防火墙内容过滤、模板隐私保护的DNA比对等领域,文中给出了实际应用中的具体案例.

关键词：有限自动机双系统加密隐私保护语义安全

对适用于移动通信的代理签名方案的安全性分析

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中国科学：信息科学 2010年第6期40卷 796-800页

作者：李发根 SHIRASE Masaaki takagi tsuyoshi 电子科技大学计算机科学与工程学院成都610054 西安电子科技大学计算机网络与信息安全教育部重点实验室西安710071 日本公立函馆未来大学系统信息科学学院

在代理签名方案中,允许一个原始签名者把他的签名权利委托给一个称为代理签名者的人,然后代理签名者就可以代表原始签名者进行签名.Lu等(Science in China Series F-Information Sciences,2008,51(2):183-195)提出了两个适用于移动通信... 详细信息

在代理签名方案中,允许一个原始签名者把他的签名权利委托给一个称为代理签名者的人,然后代理签名者就可以代表原始签名者进行签名.Lu等(Science in China Series F-Information Sciences,2008,51(2):183-195)提出了两个适用于移动通信的代理签名方案.尽管他们证明其方案在随机预言模型下是安全的,本文显示他们的方案是不安全的.

关键词：代理签名代理聚合签名双线性对伪造攻击

密钥弹性泄漏安全的通配模板层次委托加密机制

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软件学报 2015年第5期26卷 1196-1212页

作者：张明武王春枝杨波高木刚湖北工业大学计算机学院湖北武汉430068 陕西师范大学计算机学院陕西西安710071 Institute of Mathematics for Industry Kyushu UniversityFukuoka 819-0395Japan

传统的密码方案假定密钥对可能的攻击者来说是完全隐藏的(只有算法是公开的),敌手无法获得有关密钥的任何信息.但在实际系统中,攻击者可在噪声信道或由侧信道攻击获得有关密钥的部分信息.密钥弹性泄漏安全的加密方案通过改进密码算法达... 详细信息

传统的密码方案假定密钥对可能的攻击者来说是完全隐藏的(只有算法是公开的),敌手无法获得有关密钥的任何信息.但在实际系统中,攻击者可在噪声信道或由侧信道攻击获得有关密钥的部分信息.密钥弹性泄漏安全的加密方案通过改进密码算法达到在密钥存在可能部分泄漏情况下的语义安全性.设计了一个抗密钥弹性泄漏的可委托层次模板加密方案.在该方案中,用户身份关联到含有通配符的身份模板,并可以实现再次密钥委托.该方案是抗泄漏的层次身份加密方案(hierarchical identity-based encryption,简称HIBE)和隐藏向量加密方案(hidden vector encryption,简称HVE)的一般扩展,可有效地抵抗密钥弹性泄漏,并达到自适应语义安全性.同时给出该方案的安全性证明和系统抗泄漏性能,分析显示,该方案具有较好的密钥泄漏容忍性.

关键词：通配身份基加密弹性泄漏密钥委托身份模板泄漏率

The structure and function of major Ca2+ binding protein (CBP40) in slime mold, Physarum pofycephalum.

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The structure and function of major Ca2+ binding protein (CB...

Piezoelectric Power Harvesting via Acoustic-Pressure Driven by Low-Speed Wind-Force with Resonating-Tube and Wind-Collector

Third Congress of the Asian-Pacific Organization for Cell Biology

作者： Akio Nakamura tsuyoshi Okagaki Takashi takagi Kazuhiro Kohama Dept. of pharmacol. Gunma Univ. Sch. of Med. Maebashi 371 Biol. Inst.Fac. of Sci. Tohoku Univ.Sendai 980

We purified CBP40 as a major Ca2+ binding protein with Mr 40kDa from plasmodia of lower eukaryote, Physarum. Cloning of the protein revealed that it is consisted of 355 a.a. residues. The CBP40 had following

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Journal of Power and Energy Engineering 2018年第11期6卷 53-64页

作者： Seiichi Deguchi Hiroya Taguchi Hajime Arimura Noriyuki Kobayashi Norifumi Isu Kentaro takagi tsuyoshi Inoue Takashi Nozoe Seigo Saito Takahiko Sano Department of Chemical Process Engineering Nagoya University Nagoya Japan Analysis & Assessment Center LIXIL Corporation Noda Japan Department of Mechanical Systems Engineering Nagoya University Nagoya Japan Fuji Ceramics Corporation Fujinomiya Japan

Wind-driven power harvestings attract attentions since their target wind speeds are quite low less than the so-called cut-in wind speed, which is generally recognized as around 3 m/s. The extant power harvestings driven by wind-induced-air-column-resonations (i.e. acoustic-pressures) are still lacking simplicity, scale flexibility and solid strategies for practical applications. Therefore, the piezoelectric power harvesters via acoustic-pressures driven by low-speedwind-forces with resonating-tubes and wind-collectors were invented so as to complement all the lacks. The wind-collector as well as the resonating-tube contributed to upraise the power harvesting density. The champion power harvesting density of 19.5 nW/dm2 could be procured at 2.3 m/s of an artificial wind and the optimal resonating-tube and wind-collector. Power harvesting proofs from the natural wind with low mean speeds down to about 0.6 m/s were successfully obtained. The cut-in wind speed of the prototype piezoelectric power harvester was found to be quite low as about 0.4 m/s, signifying its ubiquity. Finally, a multi-bundle pendant-type piezoelectric power harvester was specifically presented together with professing the solid and multiple strategies for practical applications.

关键词： Piezoelectric Power Generation Low Wind Speed Resonating Tube Wind Collector Power Harvesting Practical Demonstration

Piezoelectric Power Harvesting Process via Phase Changes of Low-Boiling-Point Medium Together with Water for Recovering Low-Temperature Heats

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Journal of Power and Energy Engineering 2018年第11期6卷 65-77页

作者： Seiichi Deguchi Akinori Miyajima Hajime Arimura Haruna Banno Noriyuki Kobayashi Norifumi Isu Kentaro takagi tsuyoshi Inoue Takashi Nozoe Seigo Saito Takahiko Sano Department of Chemical Process Engineering Nagoya University Nagoya Japan Analysis & Assessment Center LIXIL Corporation Noda Japan Department of Mechanical Systems Engineering Nagoya University Nagoya Japan Fuji Ceramics Corporation Fujinomiya Japan

Low-temperature thermal energy conversions down to exergy zero to electric power must contribute energy sustainability. That is to say, reinforcements of power harvesting technologies from extremely low temperatures less than 373 K might be at least one of minimum roles for the current generations. Then, piezoelectric power harvesting process for recovering low-temperature heats was invented by using a unique biphasic operating medium of an underlying water-insoluble/low-boiling-point medium (i.e. NOVEC manufactured by 3M Japan Ltd.) in small quantity and upper-layered water in large quantity. The higher piezoelectric power harvesting densities were naturally revealed with an increase in heating temperatures. Excessive cooling of the operating medium deteriorated the power harvesting efficiency. The denser operating medium was surpassingly helpful to the higher piezoelectric power harvesting density. Concretely, only about 5% density increase of main operating medium (i.e. water with dissolving alum at 0.10 mol/dm3) came to the champion piezoelectric power harvesting density of 92.6 pW/dm2 in this study, which was about 1.4 times compared to that with the original biphasic medium of pure water together with a small quantity of NOVEC.

关键词： Piezoelectric Power Generation Low-Temperature Heat Recovery Biphasic Medium Phase Change Multiphase Flow Power Harvesting