“2020密码学与区块链”系列讲座

主讲人:丁津泰
时间: 周二 9:00-10:30,2020-7-28
地点:线上

报告人简介

Date:2020-7-28


Title: MULTIVARIATE PUBLIC KEY CRYPTOSYSTEMS – CANDIDATES FOR THE POST-QUANTUM STANDARDS

Speaker: Prof. Jintai Ding (丁津泰), University of Cincinnati 

Time: July 28, Tuesday, 9am to 10:30am Beijing time.

Abstract: Multivariate public key cryptosystems (MPKC) are one of the four main families of post-quantum public key cryptosystems. In a MPKC, the public key is given by a set of quadratic polynomials and its security is based on the hardness of solving a set of multivariate polynomials. In this talk, we will give an introduction to the multivariate public key cryptosystems including the main designs, the main attack tools and the mathematical theory behind in particular algebraic geometry. We will also present state of the art research in the area.

Zoom Webinar ID: 845 0849 2689
Passcode: 543982



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Date:2020-7-3

Title: Trust and Trustworthiness of Voting Systems

Speaker:Peter Y A Ryan

Zoom Webinar ID: 863 2744 6870
Password: 237111317

Abstract:Democracy is a defining feature of civilised societies, but it is delicate and vulnerable. In recent years, we have seen the threats to democratic processes brought into sharp relief, and, arguably, we have witnessed some spectacular failures of democracy.  The increasing digitisation of democracy brings with it the potential to enrich it but also a raft of novel and poorly understood attack vectors.

 
In this talk I will discuss attempts by the information security and crypto communities to address the challenge making elections secure. It is essential that an election deliver not only the correct outcome, but also sufficient evidence to demonstrate to all, especially the losers, that it is the correct outcome. And of course, all this must be achieved without undermining ballot privacy or coercion resistance.   Furthermore, it is essential that any solution be not only technically valid but also supremely usable and acceptable to all stakeholders.
 
Most approaches to voter-verifiable elections involve the voter checking the presence of an encryption of her vote on a secure bulletin board (public ledger) in the input to the (verifiable) tabulation process. In this talk, by contrast, I will outline a new voter-verification scheme, Selene, that allows each voter to confirm that her vote is correctly counted in an intuitive, transparent fashion: by identifying the vote in plaintext in the tally via a private, deniable tracker. Our hope is that this will provide not only a trustworthy system but also one that will inspire the trust of all stakeholders.


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Date:2020-6-9

Title: Modern cryptography and its applications

Speaker:丁津泰

Abstract:Cryptography used to be a subject only government institutions were interested in and controlled. But since 1960s, the appearance of large computer network and its ubiquitous usage in our daily lives completely change the game. In this talk, I would like to give an introduction on the development of modern cryptography, in particular, public key cryptography, and how its ubiquitous application make cryptography a critical part of the foundation of our modern information society. I will also cover some critical topics in the current development, like post-quantum cryptography, privacy protection and blockchain.


http://ymsc.tsinghua.edu.cn/cn/content/show/99-25.html

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