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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（星期二）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 proxyre-encryption (PRE) with alleviated trust in the proxy, say the master secretsecurity (MSS) and the non-transitivity (NT) security, in the standard model,and achieve the following:

A multi-hopMSS-secure bidirectional PRE scheme with security against chosen plaintextattacks (CPA) in the standard model, which is based upon the decisionalbilinear Diffie-Hellman (DBDH) and discrete logarithm (DL) assumptions. Theproposed scheme enjoys the property of constant size of ciphertext, regardlesshow many times it has been re-encrypted. To the best of our knowledge, thereexists previously no MSS-secure multi-hop bidirectional PRE scheme withconstant size of ciphertexts (whether in the random oracle model or not).

A single-hop MSS-secure andnon-transitive bidirectional PRE scheme with security against chosen ciphertextattacks (CCA) in the standard model. In comparison with the only known (directconstruction of) bidirectional PRE scheme in the standard model [Canetti andHohenberger, CCS 2007], besides the added MSS security and NT security, ourscheme is also essentially more efficient and has shorter ciphertexts.

The security analysisuses Corons technique [Coron, Crypto 2000], which particularly allows adaptivesecret-key corruption. Along the way, we also refine and clarify the securitymodels for bidirectional PRE (including CCA security, MSS security and NTsecurity). Our PRE constructions are novel: the CPA-secure scheme is new; theCCA-secure scheme is based on the CPA-secure scheme and particularly employs anew re-encryption key (REK) generation mechanism (similar to Diffie-Hellmankey-exchange but w.r.t. a different generator) to which each user makes equalcontributions, so that the proxy needs not to distinguish the transform directionwhen 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、IEEETPAMI、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