题  目：It All Started with Compression: Another Look at Reconciliation-Based LWE Key Exchange

内容简介：To embrace the increasing challenge from the growth of quantum threats, there emerge a lot of quantum-resist key exchange scheme based on (Ring-)LWE problem. The reconciliation technique has become a crucial building tool for the vast majority of (Ring-)LWE key exchange schemes where two parties in communication try to eliminate the effect of the errors introduced by the underlying intractable problem and agree on a common value. However, the construction of these reconciliation mechanisms appears to be tricky and obscure. In this work we analyze some typical reconciliation mechanisms and  present a framework to derive these reconciliation mechanisms and corresponding key exchange schemes from some public key encryption schemes with compression. Our encryption-based approach leads to a unified and clearer interpretation of reconciliation technique and simplifies the design of (Ring-)LWE-based key exchange scheme. With this point of view, we also present some new encryption-based key exchange schemes as applications.

报告人：中国科学院数学与系统科学研究院  潘彦斌  副研究员

报告人简介：2005年南京大学数学系本科毕业后进入中国科学院数学与系统科学研究院学习密码学，2010年博士毕业后进入中科院数学与系统科学研究院工作，现任副研究员。研究兴趣主要包括格算法与格密码的安全性分析，计算数论等。在IEEE IT、 PKC、 CT-RSA、CRYPTO、ISIT、ISSAC等国际顶级期刊及会议发表论文多篇，曾担任ISC，Africacrypt等国际会议程序委员会委员，主持国家自然科学基金2项。

时  间：2019年9月22日（周日）下午2：00始

地  点：南海楼124室

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