时间：2018年4月12日（周四）上午10：40
地点：仓山校区成功楼603报告厅
主讲：陈洁研究员主办：数学与信息学院、福建省网络安全与密码技术重点实验室
专家简介：陈洁，博士，华东师范大学研究员、博士生导师，主要研究方向为公钥密码学。2008年本科毕业于苏州大学，2013年博士（后）毕业于新加坡南洋理工大学，同年9月加入华东师范大学，2016年期间兼职任里昂高等师范学院ENS de Lyon Researcher。多项成果发表在密码学三大会议（CRYPTO、EUROCRYPT、ASIACRYPT）、PKC、DCC、TCS。近年来，担任PKC 2018、ASIACRYPT 2017、ACNS 2015等国际会议程序委员，为IACR会议做了大量审稿工作。
报告摘要：Among all existing identity-based encryption (IBE) schemes in the bilinear group, Wat-IBE proposed by Waters [CRYPTO, 2009] and JR-IBE proposed by Jutla and Roy [AsiaCrypt, 2013] are quite special. A secret key and/or ciphertext in these two schemes consist of several group elements and an integer which is usually called tag. A series of prior work was devoted to extending them towards more advanced attribute-based encryption (ABE) including inner-product encryption (IPE), hierarchical IBE (HIBE). Recently, Kim et al. [SCN, 2016] introduced the notion of tag-based encoding and presented a generic framework for extending Wat-IBE. We may call these ABE schemes ABE with tag or tag-based ABE. Typically, a tag-based ABE construction is more efficient than its counterpart without tag. However the research on tag-based ABE severely lags---We do not know how to extend JR-IBE in a systematic way and there is no tag-based ABE for boolean span program even with Kim et al.'s generic framework.