题目：Secure Group Data Sharing and Data Auditing in Public Clouds  

报告人：沈剑 

时间：11月16日上午9：30-11:00 

地点：3224会议室  

Abstract:  

Data sharing in cloud computing enables multiple participants to freely share the group data, which improves the efficiency of work in cooperative environments and has widespread potential applications. However, how to ensure the security of data sharing within a group and how to efficiently share the outsourced data in a group manner are formidable challenges. Note that key agreement protocols have played a very important role in secure and efficient group data sharing in cloud computing. By leveraging the key agreement and the group signature, on the one hand, group members should communicate anonymously with respect to the group signature, while the real identity of members can be traced if necessary. On the other hand, a common conference is derived based on the key agreement to enable group members to share and store their data securely. In addition, it becomes an urgent need for users to verify whether CSPs have stored their data securely. Hence, an efficient public auditing protocol directed at outsourced data with global and sampling blockless verification as well as batch auditing is required. A doubly linked info table and a location array can be engaged to construct a novel dynamic structure to reduce the computational and communication overheads.  

报告人简介： 

沈剑，江苏南京人，现任南京信息工程大学计算机与软件学院副院长、江苏省网络监控工程中心副主任，教授、博导、云计算安全团队学术带头人，2015年入选江苏省“双创人才”-双创博士、入选江苏省“六大人才高峰”。一直从事信息安全、密码学、网络安全、数据安全等方面的研究工作。沈剑分别于2009年8月和2012年8月在韩国获得工学硕士学位和工学博士学位，并于2012年12月回国任职。主要研究方向包括：密钥协商、公钥加密、数据分享、轻质认证等方向。沈剑担任多个国际期刊编委及多个国际会议程序委员会委员。近年来，已在IEEE Transactions、IEICE Transactions等国内外期刊和国际会议上发表学术论文十余篇。主持国家自然科学基金青年和面上项目各一项、参与国家自然科学基金重点项目一项，主持南京市留学回国人员科技活动项目优秀项目一项等。