各部门、各单位：
应我校无线网络安全技术国家工程实验室邀请，暨南大学翁健教授将于10月30日来我校做信息安全主题学术报告，欢迎广大师生参加！具体安排如下：
报告时间：2018年10月30日（周二）16:30—18:00
报告地点：通信与信息工程学院大楼106室
报告题目：代理重加密研究
摘要：we study (the direct constructions of) bidirectional proxy re-encryption (PRE) with alleviated trust in the proxy, say the master secret security (MSS) and the non-transitivity (NT) security, in the standard model, and achieve the following:
A multi-hop MSS-secure bidirectional PRE scheme with security against chosen plaintext attacks (CPA) in the standard model, which is based upon the decisional bilinear Diffie-Hellman (DBDH) and discrete logarithm (DL) assumptions. The proposed scheme enjoys the property of constant size of ciphertext, regardless how many times it has been re-encrypted. To the best of our knowledge, there exists previously no MSS-secure multi-hop bidirectional PRE scheme with constant size of ciphertexts (whether in the random oracle model or not).
A single-hop MSS-secure and non-transitive bidirectional PRE scheme with security against chosen ciphertext attacks (CCA) in the standard model. In comparison with the only known (direct construction of) bidirectional PRE scheme in the standard model [Canetti and Hohenberger, CCS 2007], besides the added MSS security and NT security, our scheme is also essentially more efficient and has shorter ciphertexts.
The security analysis uses Corons technique [Coron, Crypto 2000], which particularly allows adaptive secret-key corruption. Along the way, we also refine and clarify the security models for bidirectional PRE (including CCA security, MSS security and NT security). Our PRE constructions are novel: the CPA-secure scheme is new; the CCA-secure scheme is based on the CPA-secure scheme and particularly employs a new re-encryption key (REK) generation mechanism (similar to Diffie-Hellman key-exchange but w.r.t. a different generator) to which each user makes equal contributions, so that the proxy needs not to distinguish the transform direction when it re-encrypts ciphertexts.
报告人简介：翁健，暨南大学信息科学技术学院/网络空间安全学院教授、执行院长。博士毕业于上海交通大学。在CRYPTO、EUROCRYPT、ASIACRYPT、TCC、PKC、CT-RSA、IEEE TPAMI、IEEE TDSC等国际会议和国际期刊上发表了80多篇论文。主持了包括国家重点研发计划课题、国家自然科学项目（杰青、重点、面上和青年项目）、教育部霍英东基金项目等10多项项目。担任NSFC信息学部会评专家、广东省第六届学位委员会工学II组学科评议组成员、暨南大学第十一届学位评定委员会委员兼工学分委会主席、信息安全国际会议SecureComm 2016大会主席、ISPEC 2011程序委员会主席和RFIDsec'13 Asia程序委员会主席，以及40多次国际会议程序委员会委员。曾入选教育部新世纪优秀人才支持计划、广东省“千百十工程”国家级培养对象、广东省珠江学者特聘教授等。曾获中国密码学会首届密码创新奖、2017年度全国网络安全优秀教师等奖励。
特此通知。
科研处
通信与信息工程学院
2018年10月29日
