2017年3月6日，日本筑波大学李颉教授访问网络安全与密码技术重点实验室，并于当日上午在成功楼603报告厅作了题为“Cloud Security  Challenges”的学术报告。

    云计算是当下研究的热门课题，云计算系统因可以提供越来越多的数据服务而愈发受到用户的欢迎。本次报告会上，李教授首先介绍了云模型，随后讲述了在使用云计算系统时所面临的一些挑战特别是云存储安全方面的挑战。就该挑战，李教授着重分析了对云上用户数据进行完整性验证和对数据进行访问控制的云数据审计服务方法的模型及其性能。

    整场报告的气氛热烈，在报告最后，就大家关心的问题，李教授耐心给予了详细解答，并进一步与大家探讨和交流了该领域前沿科研成果及所面临的机遇与挑战，带给实验室师生很多启发。

    专家简介：Jie Li received the B.E. degree in computer science from Zhejiang  University, Hangzhou, China, the M.E. degree in electronic engineering and  communication systems from China Academy of Posts and Telecommunications,  Beijing, China. He received the Dr. Eng. degree from the University of  Electro-Communications, Tokyo, Japan. He is with Faculty of Engineering,  Information and Systems, University of Tsukuba, Japan, where he is a Professor.  His current research interests are in mobile distributed computing and  networking, big data and cloud computing, network security, OS, modeling and  performance evaluation of information systems. He was a visiting Professor in  Yale University, USA, Inria Sophia Antipolis, France and Inria  Grenoble–Rhone-Aples, France. He is a senior member of IEEE and ACM and a member  of IPSJ (Information Processing Society of Japan). He is the Chair of Technical  Committee on Big Data (TCBD), IEEE Communications Society. He has served as a  secretary for Study Group on System Evaluation of IPSJ and on several editorial  boards for the international Journals, and on Steering Committees of the SIG of  System EVAluation (EVA) of IPSJ, the SIG of DataBase System (DBS) of IPSJ, and  the SIG of MoBiLe computing and ubiquitous communications of IPSJ. He has also  served on the program committees for several international conferences such as  IEEE INFOCOM, IEEE GLOBECOM, and IEEE MASS.

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