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oai:www.ideals.illinois.edu:2142/45414 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Physical layer Jamming Interference Channel capacity Secure protocols for wireless availability Hu, Yih-Chun Hu, Yih-Chun Vaidya, Nitin H. Borisov, Nikita Gunter, Carl A. Chang, Sang-Yoon 2013-08-22T16:39:29Z 2013-08-22T16:39:29Z 2013-08 2013-08-22T16:39:29Z 2013-08 Since wireless networks share a communication medium, multiple transmissions on the same channel cause interference to each other and degrade the channel quality, much as multiple people talking at the same time make for inefficient meetings. To avoid transmission collision, the network divides the medium into multiple orthogonal channels (by interleaving the channel access in frequency or time) and often uses medium access control (MAC) to coordinate channel use. Alternatively (e.g., when the wireless users use the same physical channel), the network users can emulate such orthogonal channel access in processing by spreading and coding the signal. Building on such orthogonal access technology, this dissertation studies protocols that support the coexistence of wireless users and ensure wireless availability. In contrast to other studies focusing on improving the overall e fficiency of the network, I aim to achieve reliability at all times. Thus, to study the worst-case misbehavior, I pose the problem within a security framework and introduce an adversary who compromised the network and has insider access. In this dissertation, I propose three schemes for wireless availability: SimpleMAC, Ignore-False-Reservation MAC (IFR-MAC), and Redundancy O ffset Narrow Spectrum (RONS). SimpleMAC and IFR-MAC build on MAC protocols that utilize explicit channel coordination in control communication. SimpleMAC counters MAC-aware adversary that uses the information being exchanged at the MAC layer to perform a more power e fficient jamming attack. IFR-MAC nulli ffies the proactive attack of denial-of-service injection of false reservation control messages. Both SimpleMAC and IFR-MAC quickly outperform the Nash equilibrium of disabling MAC and converge to the capacity-optimal performance in worst-case failures. When the MAC fails to coordinate channel use for orthogonal access or in a single-channel setting (both cases of which, the attacker knows the exact frequency and time location of the victim's channel access), RONS introduces a physical-layer, processing-based technique for interference mitigation. RONS is a narrow spectrum technology that bypasses the spreading cost and eff ectively counters the attacker's information-theoretically optimal strategy of correlated jamming. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2013-07-01T15:10:57Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Chang_Sang-Yoon.pdf: 1982579 bytes, checksum: 19c5284e0557de0dc76e6bcd4c2d152f (MD5) Made available in DSpace on 2013-08-22T16:39:29Z (GMT). No. of bitstreams: 2 Sang-Yoon_Chang.pdf: 1982579 bytes, checksum: 19c5284e0557de0dc76e6bcd4c2d152f (MD5) license.txt: 4063 bytes, checksum: b2d5bf88b8f5f111828342212fb33dbf (MD5) http://hdl.handle.net/2142/45414 en Copyright 2013 Sang-Yoon Chang Wireless Security Medium access control text Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD