Freeform User Interfaces for Graphical Computing

報告番号: 甲15222 ; 学位授与年月日: 2000-03-29 ; 学位の種別: 課程博士 ; 学位の種類: 博士(工学) ; 学位記番号: 博工第4717号 ; 研究科・専攻: 工学系研究科情報工学専

Teaching Your Wireless Card New Tricks: Smartphone Performance and Security Enhancements Through Wi-Fi Firmware Modifications

Smartphones come with a variety of sensors and communication interfaces, which make them perfect candidates for mobile communication testbeds. Nevertheless, proprietary firmwares hinder us from accessing the full capabilities of the underlying hardware platform which impedes innovation. Focusing on FullMAC Wi-Fi chips, we present Nexmon, a C-based firmware modification framework. It gives access to raw Wi-Fi frames and advanced capabilities that we found by reverse engineering chips and their firmware. As firmware modifications pose security risks, we discuss how to secure firmware handling without impeding experimentation on Wi-Fi chips. To present and evaluate our findings in the field, we developed the following applications. We start by presenting a ping-offloading application that handles ping requests in the firmware instead of the operating system. It significantly reduces energy consumption and processing delays. Then, we present a software-defined wireless networking application that enhances scalable video streaming by setting flow-based requirements on physical-layer parameters. As security application, we present a reactive Wi-Fi jammer that analyses incoming frames during reception and transmits arbitrary jamming waveforms by operating Wi-Fi chips as software-defined radios (SDRs). We further introduce an acknowledging jammer to ensure the flow of non-targeted frames and an adaptive power-control jammer to adjust transmission powers based on measured jamming successes. Additionally, we discovered how to extract channel state information (CSI) on a per-frame basis. Using both SDR and CSI-extraction capabilities, we present a physical-layer covert channel. It hides covert symbols in phase changes of selected OFDM subcarriers. Those manipulations can be extracted from CSI measurements at a receiver. To ease the analysis of firmware binaries, we created a debugging application that supports single stepping and runs as firmware patch on the Wi-Fi chip. We published the source code of our framework and our applications to ensure reproducibility of our results and to enable other researchers to extend our work. Our framework and the applications emphasize the need for freely modifiable firmware and detailed hardware documentation to create novel and exciting applications on commercial off-the-shelf devices

Winona Daily News

https://openriver.winona.edu/winonadailynews/1896/thumbnail.jp

Memorial Statements of the Cornell University Faculty 1990-1999 (Volume 7)

Proofreaders included: Barry B. Adams, Royal D. Colle, Gould P. Colman, P.C. Tobias de Boer, Ronald B. Furry, Donald F. Holcomb, Malden C. Nesheim, Porus D. Olpadwala and Milo E. Richmond. Judith A. Bower, who has edited these booklets for many years, has had oversight for quality control. J. Robert Cooke, co-founder of the Internet-First University Press with Kenneth M. King, was producer. J. Robert Cooke also served as Dean of the University Faculty (1998-2003). The archival copies of the source materials were provided by Diane D. LaLonde of the Office of the Dean of the Faculty and Elaine Engst of the Division of Rare and Manuscript Collection. The scanning and optical character recognition services were provided by Fiona Patrick and colleagues in the Cornell University Library’s Digital Consulting and Production Services.The custom of honoring each deceased faculty member through a memorial statement was established in 1868, just after the founding of this University. Since 1938 the Office of the Dean of the Faculty has produced annually a memorial booklet which is sent to the families of the deceased and filed with the University Archives. We are now making these memorial statements (1868 through 2008) readily available online, and for convenience, are grouping these by decade in which the death occurred, assembling the memorials alphabetically within the decade. The Statements for the earlier years (1868 through 1938, assembled by Dean Cornelius Betten) are included in volume one. Many of these also include retirement statements; when available, these follow the companion memorial statement in this book. The first two years of the annual booklets are group with these to complete the decade. A few archival copies are being bound and stored in the Office of the Dean of the Faculty and in the Rare and Manuscript Collection in Kroch Library. These documents are full-text searchable across all years. Individual memorial statements, as well as volumes of these, may be downloaded. These PDF files provide bookmarks and a contents listing with each entry hyperlinked for convenient access. For historical purposes, scans of the original documents are also accessible