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

内容簡介：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.

報告人：中國科學院數學與系統科學研究院  潘彥斌  副研究員

報告人簡介：2005年南京大學數學系本科畢業後進入中國科學院數學與系統科學研究院學習密碼學，2010年博士畢業後進入中科院數學與系統科學研究院工作，現任副研究員。研究興趣主要包括格算法與格密碼的安全性分析，計算數論等。在IEEE IT、 PKC、 CT-RSA、CRYPTO、ISIT、ISSAC等國際頂級期刊及會議發表論文多篇，曾擔任ISC，Africacrypt等國際會議程序委員會委員，主持國家自然科學基金2項。

時  間：2019年9月22日（周日）下午2：00始

地  點：南海樓124室

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