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oai:www.ideals.illinois.edu:2142/29432 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Hu, Yih-Chun Kumar, P.R. Vaidya, Nitin H. Borisov, Nikita Chiang, Jerry T. 2012-02-01T00:46:12Z 2012-02-01T00:46:12Z 2014-02-01T11:00:26Z 2011-12 2012-02-01T00:46:12Z 2011-12 Availability, together with confidentiality and integrity, form the basic concepts of information security. Indeed, a device, protocol, or network can enjoy the highest level of confidentiality and integrity, but still be of very little value to its clients if it is not available. In this dissertation, I consider the availability of wireless networks, which have permeated into almost every aspect of our daily life, from entertainment such as online games to utility infrastructure such as smart grids. A faulty entity can disrupt the connectivity offered by the lower layers of a wireless network and interrupt the provided services; thus, network availability in the lower layers is essential both to prevent inconveniences and to reliably provide critical services. This dissertation considers three major philosophies that aim to provide availability by defending against denial-of-service (DoS) attacks at the lower layers. Specifically, a network can 1. detect misbehaviors to eliminate DoS attacks; 2. enforce fairness to mitigate DoS attacks; or 3. adopt randomization to escape DoS attacks. For each philosophy, this dissertation presents a case study. I present a location verification protocol at the physical (PHY) layer that detects misbehavior in order to provide reliable position-based services. I also present a transport layer protocol that mitigates the flooding attack by enforcing Transport Control Protocal (TCP) fairness. I then present a flooding protocol that uses randomness at the PHY layer to escape from the jamming attack. Item withdrawn by Rebecca Bryant (rabryant@illinois.edu) on 2011-11-30T14:54:06Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Chiang_Jerry.pdf: 4613464 bytes, checksum: fd079f7c00c71493ab0870c1f32d8296 (MD5) Made available in DSpace on 2012-02-01T00:46:12Z (GMT). No. of bitstreams: 2 Chiang_Jerry.pdf: 4613464 bytes, checksum: fd079f7c00c71493ab0870c1f32d8296 (MD5) license.txt: 4061 bytes, checksum: 7882bc9a377c5ea301d984e002ca3148 (MD5) Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:21Z Item is restricted until 2014-02-01T00:50:07Z Item reinstated by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z Item was in collections: Graduate Theses and Dissertations at Illinois (ID: 204) Dissertations and Theses - Electrical and Computer Engineering (ID: 446) No. of bitstreams: 3 Chiang_Jerry.pdf: 4613464 bytes, checksum: fd079f7c00c71493ab0870c1f32d8296 (MD5) license.txt: 4061 bytes, checksum: 7882bc9a377c5ea301d984e002ca3148 (MD5) Chiang_Jerry.pdf.txt: 233126 bytes, checksum: fec9d3db6815829675f24f77dcff137b (MD5) Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-02-01T11:00:26Z http://hdl.handle.net/2142/29432 en Copyright 2011 Jerry Chiang availability lower layers wireless networks Providing availability in the lower layers of a wireless network: philosophies and case studies Dissertation / Thesis text Electrical and Computer Engineering 1933 Electrical and Computer Engr 1200 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Electr & Computer Eng-UIUC 10KS1200PHD