Group key management technique is a fundamental building block for secure and reliable group communication systems.In order to successfully achieve this goal, group session key needs to be generated and distributed to...Group key management technique is a fundamental building block for secure and reliable group communication systems.In order to successfully achieve this goal, group session key needs to be generated and distributed to all group members in a secure and authenticated manner.The most commonly used method is based on Lagrange interpolating polynomial over the prime field F p={0,1,2,…, p-1}. A novel approach to group key transfer protocol based on a category of algebraic-geometry code is presented over the infinite field GF(2 m). The attractive advantages are obvious. Especially, the non-repeatability, confidentiality, and authentication of group key transfer protocols are obtained easily. Besides, a more generalized and simple mathematical construction model is proposed which also can be applied perfectly to related fields of information security.展开更多
A new secure oblivious transfer （OT） protocol from indistinguishability obfuscation （iO） is proposed in this paper. The candidate iO and a dual-mode cryptosystem are the main technical tools of this scheme. Garg e...A new secure oblivious transfer （OT） protocol from indistinguishability obfuscation （iO） is proposed in this paper. The candidate iO and a dual-mode cryptosystem are the main technical tools of this scheme. Garg et al. introduced a candidate construction of iO in 2013. Following their steps, a new k-out-of-1 OT protocol is presented here, and its realization from decisional Diffie-Hellman （DDH） is described in this paper, in which iO was combined with the dual-mode cryptosystem. The security of the scheme mainly relies on the indistinguishability of the obf-branches （corresponding to the two modes in dual-mode model）. This paper explores a new way for the application of iO.展开更多
Nowadays, there is a growing emphasis on Inter-basin water transfer projects as costly activities with ambiguous effects on environment, society and economy. Since the concept of climate change was in its embryonic ph...Nowadays, there is a growing emphasis on Inter-basin water transfer projects as costly activities with ambiguous effects on environment, society and economy. Since the concept of climate change was in its embryonic phase before 1990’s, the majority of these projects planned before that period have not considered the effect of long term variation of water resources. In all of these numerous operational and under-construction projects, an intelligent selection of the best water transmission protocol, can help the governments to optimize their expenditures on these projects ,and also can help water resources managers to face climate change effects wisely. In this paper as a case study, Dez to Qomrood inter-basin water transfer project is considered to evaluate the efficiency of three different protocols in long term. The effect of climate change has been forecasted via a wide range of GCMs (Global Circulation Model) in order to calculate the change of flow in the basin's area with different climate scenarios. After these calculation, a water allocation model has been used to evaluate which of these three water transmission protocols (Proportional Allocation (PA), Fix Upstream allocation (FU), and Fix Downstream allocation (FD)) is the most efficient logic switch economically in a framework including both upstream and downstream stakeholders. As the final result, it can be inferred that Fix Downstream allocation (FD) protocol can supply more population especially with urban water for a fix expense and also is the most adapted protocol with future global change, at least in the first round of sustainability assessment.展开更多
This paper deeply discusses the design method of the File Transfer System(FTS)which is based on the File Transfer, Access and Management(FTAM) protocol standard, and probes into the construction principle of the Virtu...This paper deeply discusses the design method of the File Transfer System(FTS)which is based on the File Transfer, Access and Management(FTAM) protocol standard, and probes into the construction principle of the Virtual Filestore(VFS). Finally we introduce the implementation and the key technology of the FTS system.展开更多
目的通过Meta分析探究不同内膜准备方案对子宫内膜异位症(EMs)合并不孕患者的冻融胚胎移植(FET)妊娠结局的影响。方法检索包括中国知网(CNKI)、中国维普数据库、中国生物医学文献数据库(CBM)、万方数据库、EMBASE、Web of Science、Pub...目的通过Meta分析探究不同内膜准备方案对子宫内膜异位症(EMs)合并不孕患者的冻融胚胎移植(FET)妊娠结局的影响。方法检索包括中国知网(CNKI)、中国维普数据库、中国生物医学文献数据库(CBM)、万方数据库、EMBASE、Web of Science、PubMed以及Cochrane Library在内的多个数据库进行了文献搜索,并辅以手工检索。纳入截至2024年6月1日发表的关于不同内膜准备方案对EMs合并不孕的患者行FET的临床妊娠结局影响的研究,由两名研究者合作评价纳入文献的质量,然后再利用RevMan 5.4软件进行Meta分析。结果共纳入9篇文献。Meta分析结果表明,在EMs合并不孕患者的FET周期中,选用促性腺激素释放激素激动剂(GnRH-a)降调节后人工周期(GnRH-a+HRT)方案准备内膜的临床妊娠率、胚胎着床率及移植日子宫内膜厚度显著高于人工周期(HRT)方案和自然周期(NC)方案(P<0.05)。与NC方案相比,应用HRT方案的患者流产率显著降低(P<0.05),但临床妊娠率、胚胎着床率及子宫内膜厚度未见显著差异(P>0.05)。关于异位妊娠率、多胎妊娠率、活产率以及胚胎移植数等其他结局指标,不同内膜准备方案之间未显示出显著差异(P>0.05)。结论与其他两种方案相比,GnRH-a+HRT方案提高了临床妊娠率、胚胎着床率及子宫内膜厚度,显著改善了EMs合并不孕患者的FET妊娠结局;相较于NC方案,HRT方案则降低了FET周期的流产率。需要注意的是,本研究结论主要基于中国人群的研究结果,仍需在其他人群中进一步验证以提高外推性。展开更多
基金Supported by the National Natural Science Foundation of China(No.61501064)Sichuan Technology Support Program(No.2015GZ0088)
文摘Group key management technique is a fundamental building block for secure and reliable group communication systems.In order to successfully achieve this goal, group session key needs to be generated and distributed to all group members in a secure and authenticated manner.The most commonly used method is based on Lagrange interpolating polynomial over the prime field F p={0,1,2,…, p-1}. A novel approach to group key transfer protocol based on a category of algebraic-geometry code is presented over the infinite field GF(2 m). The attractive advantages are obvious. Especially, the non-repeatability, confidentiality, and authentication of group key transfer protocols are obtained easily. Besides, a more generalized and simple mathematical construction model is proposed which also can be applied perfectly to related fields of information security.
基金supported by Opening Project of State Key Laboratory of Cryptology, Scientific Research and Postgraduate Training Cooperation Project-Scientific Research Base-New Theory of Block Cipher and Obfuscation and their Application Research, and Information Management and Professional Building of Information System
文摘A new secure oblivious transfer （OT） protocol from indistinguishability obfuscation （iO） is proposed in this paper. The candidate iO and a dual-mode cryptosystem are the main technical tools of this scheme. Garg et al. introduced a candidate construction of iO in 2013. Following their steps, a new k-out-of-1 OT protocol is presented here, and its realization from decisional Diffie-Hellman （DDH） is described in this paper, in which iO was combined with the dual-mode cryptosystem. The security of the scheme mainly relies on the indistinguishability of the obf-branches （corresponding to the two modes in dual-mode model）. This paper explores a new way for the application of iO.
文摘Nowadays, there is a growing emphasis on Inter-basin water transfer projects as costly activities with ambiguous effects on environment, society and economy. Since the concept of climate change was in its embryonic phase before 1990’s, the majority of these projects planned before that period have not considered the effect of long term variation of water resources. In all of these numerous operational and under-construction projects, an intelligent selection of the best water transmission protocol, can help the governments to optimize their expenditures on these projects ,and also can help water resources managers to face climate change effects wisely. In this paper as a case study, Dez to Qomrood inter-basin water transfer project is considered to evaluate the efficiency of three different protocols in long term. The effect of climate change has been forecasted via a wide range of GCMs (Global Circulation Model) in order to calculate the change of flow in the basin's area with different climate scenarios. After these calculation, a water allocation model has been used to evaluate which of these three water transmission protocols (Proportional Allocation (PA), Fix Upstream allocation (FU), and Fix Downstream allocation (FD)) is the most efficient logic switch economically in a framework including both upstream and downstream stakeholders. As the final result, it can be inferred that Fix Downstream allocation (FD) protocol can supply more population especially with urban water for a fix expense and also is the most adapted protocol with future global change, at least in the first round of sustainability assessment.
文摘This paper deeply discusses the design method of the File Transfer System(FTS)which is based on the File Transfer, Access and Management(FTAM) protocol standard, and probes into the construction principle of the Virtual Filestore(VFS). Finally we introduce the implementation and the key technology of the FTS system.
文摘目的通过Meta分析探究不同内膜准备方案对子宫内膜异位症(EMs)合并不孕患者的冻融胚胎移植(FET)妊娠结局的影响。方法检索包括中国知网(CNKI)、中国维普数据库、中国生物医学文献数据库(CBM)、万方数据库、EMBASE、Web of Science、PubMed以及Cochrane Library在内的多个数据库进行了文献搜索,并辅以手工检索。纳入截至2024年6月1日发表的关于不同内膜准备方案对EMs合并不孕的患者行FET的临床妊娠结局影响的研究,由两名研究者合作评价纳入文献的质量,然后再利用RevMan 5.4软件进行Meta分析。结果共纳入9篇文献。Meta分析结果表明,在EMs合并不孕患者的FET周期中,选用促性腺激素释放激素激动剂(GnRH-a)降调节后人工周期(GnRH-a+HRT)方案准备内膜的临床妊娠率、胚胎着床率及移植日子宫内膜厚度显著高于人工周期(HRT)方案和自然周期(NC)方案(P<0.05)。与NC方案相比,应用HRT方案的患者流产率显著降低(P<0.05),但临床妊娠率、胚胎着床率及子宫内膜厚度未见显著差异(P>0.05)。关于异位妊娠率、多胎妊娠率、活产率以及胚胎移植数等其他结局指标,不同内膜准备方案之间未显示出显著差异(P>0.05)。结论与其他两种方案相比,GnRH-a+HRT方案提高了临床妊娠率、胚胎着床率及子宫内膜厚度,显著改善了EMs合并不孕患者的FET妊娠结局;相较于NC方案,HRT方案则降低了FET周期的流产率。需要注意的是,本研究结论主要基于中国人群的研究结果,仍需在其他人群中进一步验证以提高外推性。
