日本九州大学（Kyushu University, Japan）Kouichi Sakurai教授学术报告通知
撰稿人：彭滔 发布时间：2018年06月13日 16:30
题目: Active Attack against Oblivious RAM
报告人: 日本九州大学（Kyushu University, Japan）Kouichi Sakurai教授
When a user consumes an encrypted digital content (for example video and music files), the player application accesses the secret key to decrypt the content. If the user is malicious, he can analyse the access pattern of the player application to extract the secret key efficiently. Oblivious RAMs (ORAMs) are effective solution for such threats. However, ORAMs are only effective for ‘passive’ attackers who can observe the RAM access done by the application, but cannot alter data stored on RAM. The attacker with ability to alter data on RAM can be called ‘active’ attackers. In this paper, we evaluate the security of ORAM schemes against active adversaries where they alter data on RAM and try to efficiently extract the secret information. We also propose countermeasures against active adversaries.
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 had been working with the Institute of Systems & Information Technologies and Nanotechnologies, as the chief of Information Security laboratory, for promoting research co-operations among the industry, university and government under the theme "Enhancing IT-security in social systems". He has been successful in generating such co-operations 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-operations 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). And concurrently he is working also with CyberSecurity Center of Kyushu University (https://cs.kyushu-u.ac.jp/en/), and doing joint project with IIT-Delhi on IoT-security (https://cs.kyushu-u.ac.jp/sicorp/en/). Professor Sakurai has published more than 350 academic papers around cryptography, information security, and CyberSecurity (See his DBLP http://dblp.uni-trier.de/pers/hd/s/Sakurai:Kouichi)