南京大学计算机软件新技术国家重点实验室      

摘 要：

Recently, online authentication including biometric is applied to various IT-systems in not only closed environment but open network. For security and privacy of such a system, compromising the biometric data is serious issue, because biometric systems require registrants’ enrolled templates and extracted feature of captured samples.Therefore, biometric authentication protocols with protection of the biometric data are developed, such as cancelable biometrics, zero-bio, etc. Security of these protocols originates in leakage of no privacy data by wiretapping, malicious access and etc. in the online authentication processes. When this data can be collected and used as an evidence of some user’ s authentication process by anyone, this situation causes novel privacy issue. We discuss this issue, which suggest us to design novel requirements of biometric authentication systems. As a first step of this argument, we consider two notions, "receipt-freeness" and "coercion-resistance". These are characteristics of remote biometric authentication protocols which mean a user or a third person do not obtain the above evidence to convince the third person. This paper mentions the case that communication between clients (user) and servers is observable. We analyze whether related biometric authentication protocols achieves "receipt-freeness" and "coercion-resistance", or not. We refer to yet another notion, deniability in cryptographic protocol and investigate the relationship of these three notions. We also introduce recent developed e-voting protocols based on Blockchain.

报告人简介:

Kouichi Sakurai received the B.S. degree in mathematics from the Faculty of Science, Kyushu University in 1986. He received the M.S. degree in applied science in 1988, and the Doctorate in engineering in 1993 from the Faculty of Engineering, Kyushu University. He was engaged in research and development on cryptography and information security at the Computer and Information Systems Laboratory at Mitsubishi Electric Corporation from 1988 to 1994. From 1994, he worked for the Dept. of Computer Science of Kyushu University in the capacity of associate professor, and became a full professor there in 2002. He is concurrently working also with the Institute of Systems & Information Technologies and Nanotechnologies, as the chief of Information Security laboratory, for promoting research co-oporations among the industry, university and government under the theme "Enhancing IT-security in social systems". He has been successful in generating such co-operation between Japan, China and Korea for security technologies as the leader of a Cooperative International Research Project supported by the National Institute of Information and Communications Technology (NICT) during 2005-2006. Moreover, in March 2006, he established research co-oporations under a Memorandum of Understanding in the field of information security with Professor Bimal Kumar Roy, the first time Japan has partnered with The Cryptology Research Society of India (CRSI). Professor Sakurai has published more than 250 academic papers around cryptography and information security

时间：8月12日  9:45-10:45

地点：计算机科学技术楼229室