CITI--Information theoretic security: from post-quantum to multimedia
- 講者Shih-Chun Lin 博士 (National Tsing-Hua University)
邀請人:鍾偉和老師 - 時間2011-01-28 (Fri.) 10:30 ~ 12:00
- 地點本所新館106演講廳
摘要
Network information theory was proved to be a powerful tool
to design reliable transmissions in multiuser channels. Recently,
network information theory has been applied to information security
problems including secrecy in post-quantum era and protecting
copyrighted multimedia. The so-called “information theoretic
security” is among the hottest topics in research society nowadays.
The first part of this talk focuses on the application of information
theoretic security on post-quantum confidentiality problem. We
consider the transmission of confidential messages over the wireless
channels subjecting to eavesdropping by terminals within the
transmission range. Conventionally, the confidentiality is assured
by cryptographic systems which are only computationally secure, and
will eventually become insecure when quantum computers or other even
more powerful computing techniques are mature. Thus we consider the
worst case scenario that the eavesdropper can perform attacks with
unlimited computations. One promising method to guarantee
confidentiality is combining secure coding and artificial-noise
assisted beam forming.
We study the impacts of quantized channel feedback on the performance
of this method. As first appeared in the literature, we identify the
important role of the artificial noise leakage problem, and propose
methods to combat it. The asymptotic analysis shows that without
proposed system designs, the secrecy rate loss may approach infinity
due to the artificial noise leakage problem.
The second part of this talk focuses on the application of information
theoretic security on the multimedia fingerprinting problem. Digital
fingerprinting is a technique to protect copyrighted data against
illegal distribution. A powerful attack to break the digital
fingerprinted system is that several users may collude to form a
coalition, enabling them to produce an unauthorized copy which is
difficult to trace the colluders. We adopt an information theoretic
framework for the design of collusion-resistant coding and decoding
(identification of colluders) schemes for digital fingerprinting.
We found out that the code design for digital fingerprinting is
closely related to that for multiple-access channel. Based on this
relationship, two practical fingerprinting codes tailored for
different collusion attacks was proposed, and both can respectively
protect the largest number of licensed users in literatures.
Bio: Shih-Chun Lin received the B.S. and Ph.D. degrees in electrical
engineering from National Taiwan University, Taipei, Taiwan, in 2000
and 2007, respectively. He was a Visiting Student at The Ohio State
University, Columbus, in 2007, hosted by Professor Hesham El Gamal
(IEEE Fellow). After serving his military duty in 2008, Dr. Lin is
a postdoctoral research associate at the Institute of Communications
Engineering, National Tsing-Hua University, Hsinchu, Taiwan now. He
also served as a TPC member of IEEE VTC 2010-Spring. His research
interests include coding/information theory, communications, and
signal processing.