A key problem of electronic commerce （for short e-commerce） is fair exchange which guarantees that at the end of the transaction, either both parties involved in the trausaction receive each other＇s items or none d...A key problem of electronic commerce （for short e-commerce） is fair exchange which guarantees that at the end of the transaction, either both parties involved in the trausaction receive each other＇s items or none do. A non-interactive optimistic fair exchange e-commerce protocol model based on the publicly verifiable secret sharing is presented. The main idea of our exchange protocol is to interchange verifiable and recoverable keys of the symmetric encryption for participants＇ items. So it is especially suitable for exchange of large-size items. Furthermore, our protocol is efficient and simple as it does not need interactive proof system which has been adopted by a large quantity of previously proposed fair exchange protocols. Based on a modified （2,2） secret sharing scheme, a concrete non-interactive fair exchange e-commerce protocol is designed.展开更多
Civilization-related issues have attracted attention because they affect international relations,global governance and international order.World politics and the Clash of Civilizations theory proposed by Western strat...Civilization-related issues have attracted attention because they affect international relations,global governance and international order.World politics and the Clash of Civilizations theory proposed by Western strategic circles raise risks of inter-civilization conflicts,whereas China's framework of building a community with a shared future for mankind advocates peace.Although civilizations are bound to diversify,and conflicts are endemic between vastly distinct civilizations,there is aproper basis for peaceful coexistence in exchanges and mutual learning.China holds that civilizations are diverse,equal and tolerant,and that different civilizations should learn from each other's civilization concept and actively practice it.For future relations between Chinese and Westerncivilizations,China promotes the benign interaction of inter-civilization exchanges and mutual learning,and the building of a community with a shared future.展开更多
在Microsoft的小组协作解决方案中，Exchange Server与Share Point Server的集成是整个方案实践中的重要基础。如今从Exchange Server 2013与Share Point Server 2013的版本开始，添加每一个小组网站的成员，能够直接在Share Point中访...在Microsoft的小组协作解决方案中，Exchange Server与Share Point Server的集成是整个方案实践中的重要基础。如今从Exchange Server 2013与Share Point Server 2013的版本开始，添加每一个小组网站的成员，能够直接在Share Point中访问小组信箱的功能，而不需要通过Outlook的连接，大幅提升了移动工作者的工作效率。展开更多
Article Exchange资源共享网站是OCLC World Share平台提供的一个具备文档分享功能的网络平台。该网站通过独特的运行模式和技术手段保障了资源共享的合法性、便捷性、自发性和及时性,其设计理念和技术支持为我国今后建设相关资源共享...Article Exchange资源共享网站是OCLC World Share平台提供的一个具备文档分享功能的网络平台。该网站通过独特的运行模式和技术手段保障了资源共享的合法性、便捷性、自发性和及时性,其设计理念和技术支持为我国今后建设相关资源共享平台提供了新思路,即打造精品特藏资源、充分注重用户体验、遵守相关法律规定和提高品牌认知度。展开更多
On February 20, the opening ceremony of the 2019 China-ASEAN Year of Media Exchanges took place in Beijing. In a congratulatory message to the event, Chinese President Xi Jinping said:“I hope the media from both side...On February 20, the opening ceremony of the 2019 China-ASEAN Year of Media Exchanges took place in Beijing. In a congratulatory message to the event, Chinese President Xi Jinping said:“I hope the media from both sides can serve as messengers of friendly exchanges, facilitators of pragmatic cooperation, guardians of harmonious coexistence and good storytellers on topics of peace and development to make great contributions to construction of a closer China-ASEAN community with a shared future.”展开更多
Dragonfly is Password Authenticated Key Exchange protocol that uses a shared session key to authenticate parties based on pre-shared secret password. It was claimed that this protocol was secure against off-line dicti...Dragonfly is Password Authenticated Key Exchange protocol that uses a shared session key to authenticate parties based on pre-shared secret password. It was claimed that this protocol was secure against off-line dictionary attack, but a new research has proved its vulnerability to off-line dictionary attack and proving step was applied by using “Patched Protocol” which was based on public key validation. Unfortunately, this step caused a raise in the computation cost, which made this protocol less appealing than its competitors. We proposed an alternate enhancement to keep this protocol secure without any extra computation cost that was known as “Enhanced Dragonfly”. This solution based on two-pre-shared secret passwords instead of one and the rounds between parties had compressed into two rounds instead of four. We prove that the enhanced-Dragonfly protocol is secure against off-line dictionary attacks by analyzing its security properties using the Scyther tool. A simulation was developed to measure the execution time of the enhanced protocol, which was found to be much less than the execution time of patched Dragonfly. The off-line dictionary attack time is consumed for few days if the dictionary size is 10,000. According to this, the use of the enhanced Dragonfly is more efficient than the patched Dragonfly.展开更多
Contemporary mainstream big data governance platforms are built atop the big data ecosystem components,offering a one-stop development and analysis governance platform for the collection,transmission,storage,cleansing...Contemporary mainstream big data governance platforms are built atop the big data ecosystem components,offering a one-stop development and analysis governance platform for the collection,transmission,storage,cleansing,transformation,querying and analysis,data development,publishing,and subscription,sharing and exchange,management,and services of massive data.These platforms serve various role members who have internal and external data needs.However,in the era of big data,the rapid update and iteration of big data technologies,the diversification of data businesses,and the exponential growth of data present more challenges and uncertainties to the construction of big data governance platforms.This paper discusses how to effectively build a data governance platform under the big data system from the perspectives of functional architecture,logical architecture,data architecture,and functional design.展开更多
基金This project was partially supported by the National Natural Science Foundation of China (60273049, 90104005).
文摘A key problem of electronic commerce （for short e-commerce） is fair exchange which guarantees that at the end of the transaction, either both parties involved in the trausaction receive each other＇s items or none do. A non-interactive optimistic fair exchange e-commerce protocol model based on the publicly verifiable secret sharing is presented. The main idea of our exchange protocol is to interchange verifiable and recoverable keys of the symmetric encryption for participants＇ items. So it is especially suitable for exchange of large-size items. Furthermore, our protocol is efficient and simple as it does not need interactive proof system which has been adopted by a large quantity of previously proposed fair exchange protocols. Based on a modified （2,2） secret sharing scheme, a concrete non-interactive fair exchange e-commerce protocol is designed.
文摘Civilization-related issues have attracted attention because they affect international relations,global governance and international order.World politics and the Clash of Civilizations theory proposed by Western strategic circles raise risks of inter-civilization conflicts,whereas China's framework of building a community with a shared future for mankind advocates peace.Although civilizations are bound to diversify,and conflicts are endemic between vastly distinct civilizations,there is aproper basis for peaceful coexistence in exchanges and mutual learning.China holds that civilizations are diverse,equal and tolerant,and that different civilizations should learn from each other's civilization concept and actively practice it.For future relations between Chinese and Westerncivilizations,China promotes the benign interaction of inter-civilization exchanges and mutual learning,and the building of a community with a shared future.
文摘在Microsoft的小组协作解决方案中，Exchange Server与Share Point Server的集成是整个方案实践中的重要基础。如今从Exchange Server 2013与Share Point Server 2013的版本开始，添加每一个小组网站的成员，能够直接在Share Point中访问小组信箱的功能，而不需要通过Outlook的连接，大幅提升了移动工作者的工作效率。
文摘Article Exchange资源共享网站是OCLC World Share平台提供的一个具备文档分享功能的网络平台。该网站通过独特的运行模式和技术手段保障了资源共享的合法性、便捷性、自发性和及时性,其设计理念和技术支持为我国今后建设相关资源共享平台提供了新思路,即打造精品特藏资源、充分注重用户体验、遵守相关法律规定和提高品牌认知度。
文摘On February 20, the opening ceremony of the 2019 China-ASEAN Year of Media Exchanges took place in Beijing. In a congratulatory message to the event, Chinese President Xi Jinping said:“I hope the media from both sides can serve as messengers of friendly exchanges, facilitators of pragmatic cooperation, guardians of harmonious coexistence and good storytellers on topics of peace and development to make great contributions to construction of a closer China-ASEAN community with a shared future.”
文摘Dragonfly is Password Authenticated Key Exchange protocol that uses a shared session key to authenticate parties based on pre-shared secret password. It was claimed that this protocol was secure against off-line dictionary attack, but a new research has proved its vulnerability to off-line dictionary attack and proving step was applied by using “Patched Protocol” which was based on public key validation. Unfortunately, this step caused a raise in the computation cost, which made this protocol less appealing than its competitors. We proposed an alternate enhancement to keep this protocol secure without any extra computation cost that was known as “Enhanced Dragonfly”. This solution based on two-pre-shared secret passwords instead of one and the rounds between parties had compressed into two rounds instead of four. We prove that the enhanced-Dragonfly protocol is secure against off-line dictionary attacks by analyzing its security properties using the Scyther tool. A simulation was developed to measure the execution time of the enhanced protocol, which was found to be much less than the execution time of patched Dragonfly. The off-line dictionary attack time is consumed for few days if the dictionary size is 10,000. According to this, the use of the enhanced Dragonfly is more efficient than the patched Dragonfly.
文摘Contemporary mainstream big data governance platforms are built atop the big data ecosystem components,offering a one-stop development and analysis governance platform for the collection,transmission,storage,cleansing,transformation,querying and analysis,data development,publishing,and subscription,sharing and exchange,management,and services of massive data.These platforms serve various role members who have internal and external data needs.However,in the era of big data,the rapid update and iteration of big data technologies,the diversification of data businesses,and the exponential growth of data present more challenges and uncertainties to the construction of big data governance platforms.This paper discusses how to effectively build a data governance platform under the big data system from the perspectives of functional architecture,logical architecture,data architecture,and functional design.
