报告题目： Lattice Klepto Revisited
报告人： 潘彦斌副研究员
报告时间： 2019年12月28日14:00-14:30
摘要： Kleptography was introduced by Young and Yung which is about using an embedded backdoor to perform attacks on a cryptosystems. At SAC'17, Kwant et al. proposed a kleptographic backdoor on NTRU encryption scheme and claimed that the backdoor can not be detected. However, in this paper we show that the user can detect the backdoor very efficiently and hence the problem of constructing a kleptographic backdoor on NTRU stays open. Moreover, we also design a universal method to embed a kleptographic backdoor for RLWE-based scheme, such as NewHope. Our construction is shown to be strongly undetectable, which reveals the threats of an algorithm substitution attacks on lattice-based schemes.
潘彦斌副研究员简历： 潘彦斌，于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。
（九）
报告题目： 多变量公钥密码的基本原理及新型构造