ECE Seminar with Joerg Kliewer

1:00 pm on Tuesday, September 11, 2012
Photonics Center, 8 Saint Mary’s St., Room 339
Coding Strategies for Link and Physical Layer Security With Professor Joerg Kliewer, New Mexico State University Faculty Host: Bobak Nazer Refreshments will be served outside Room 339 at 12:45 p.m. Abstract: In this talk, Professor Kliewer will consider physical and link layer error correction to protect against passive adversaries (eavesdropping). In particular, he will consider the wiretap channel and show that nested linear codes are able to achieve weak secrecy. He will then propose a construction using two-edge type LDPC codes based on a coset encoding scheme and find that the resulting ensembles are able to perform very close to the boundary of the rate-equivocation region of the binary erasure wiretap channel. He will then investigate how imperfect randomness in the encoding process affects the secrecy rates achievable over a discrete memoryless wiretap channel. In particular, he will characterize the secrecy capacity for a rate-limited and non-uniform local source of randomness and show that this incurs a secrecy rate penalty but does not preclude secrecy. He will then address secure network coding over networks with link erasures and unequal link capacities in the presence of a wiretapper that can wiretap any subset of k links. In contrast to the case with equal link capacities, he will show that for unequal link capacities, the secrecy capacity is not the same when the location of the wiretapped links is known or unknown. About the Speaker: Joerg Kliewer received the Dipl.-Ing. (M.Sc.) degree in electrical engineering from Hamburg University of Technology, Germany, in 1993, and the Dr.-Ing. degree (Ph.D.) in electrical engineering from the University of Kiel, Germany, in 1999, respectively. From 1993 to 1998, he was a Research Assistant at the University of Kiel, and from 1999 to 2004, he was a Senior Researcher and Lecturer with the same institution. In 2004, he visited the University of Southampton, Southampton, U.K., for one year, and from 2005 until 2007, he was with the University of Notre Dame, Notre Dame, Ind., as a Visiting Assistant Professor. In August 2007, he joined New Mexico State University, Las Cruces, N.M., as an Assistant Professor. His research interests include information theory, error correcting codes, network coding, and communication networks. Dr. Kliewer was the recipient of a Leverhulme Trust Award and a German Research Foundation Fellowship Award in 2003 and 2004, respectively. He has served as Associate Editor for the IEEE Transactions on Communications since 2008.