报告题目： Leakage-Resilient Digital Signatures

报告人：黄琼 教授 华南农业大学

主持人：张磊

报告时间：2018年1月20日（周六）8:40--9:30

报告地点：中北校区理科大楼B1002报告厅

报告人简介：

      黄琼，教授，博导。2010年获香港城市大学博士学位，2011年至今在华南农业大学工作，主要研究密码学与信息安全。近年来主持了多项国家自然科学基金和省部级科研项目，发表各类论文80余篇。现为华南农业大学数学与信息学院副院长，广东省自然科学基金杰出青年基金获得者，广东省特支计划科技创新青年拔尖人才，广州市珠江科技新星。担任中国密码学会青年工作委员会委员，中国计算机学会广州分部执行委员、YOCSEF广州分论坛副主席，广东省计算机学会理事、云计算专委会副主任委员、网络空间安全专委会副主任委员、青年工作委员会副主任委员兼秘书长。担任了40余个国际会议的程序委员会委员以及30余个国际学术期刊的同行评审专家。2016年获教育部霍英东教育基金会第十五届高等院校青年教师奖。

报告摘要：

      In recent years, side-channel attacks have shown their powers in threatening cryptosystem implementations. Leakage-resilient cryptography was proposed to prevent side-channel adversaries from breaking cryptosystems even if a fraction of the secret state is leaked. Digital signatures are an important cryptographic primitive and have a wide applications in our life. In this talk we discuss about the problem of how to generically construct secure digital signatures in the leakage-resilient setting. First, we give a black-box construction which converts a leakage-resilient signature scheme to a strongly unforgeable and leakage-resilient one, without changing the structure of the underlying signature scheme nor adding elements to the public key. Second, we show review the folklore generic constructions of identity-based signature and certificateless signature schemes, and show that if the underlying primitives are leakage-resilient, so are the resulting identity-based signature scheme and certificateless signature scheme. The leakage rate follows the minimum one of the underlying primitives. Third, we propose a new black-box construction of ring signature scheme with leakage resilience. We also give an efficient concrete construction with leakage bound ((n − 1) log q − ω(log k)), whose security is reduced to the intractability of computational Diffie-Hellman problem and leakage-resilient hard relation without random oracles.